Generated from commit: e3d1b97222272327d71e1e49d522387003e48029
diff --git a/search/search_index.json b/search/search_index.json
index eb7606d..ebc2ab1 100644
--- a/search/search_index.json
+++ b/search/search_index.json
@@ -1567,7 +1567,7 @@
},
{
"location": "/xgc/",
- "text": "-Xgc\n\n\nOptions that change the behavior of the Garbage Collector (GC).\n\n\nSyntax\n\n\n -Xgc:<parameter>\n\n\n\n\n\nParameters\n\n\n\n\n\n\n\n\nParameter\n\n\nEffect\n\n\n\n\n\n\n\n\n\n\nconcurrentScavenge\n \n\n\nEnables a garbage collection (GC) mode with less pause times (Linux on IBM Z\u00ae and z/OS\u00ae only).\n\n\n\n\n\n\ndnssExpectedTimeRatioMaximum\n\n\nSets the maximum time to spend on GC of the nursery area.\n\n\n\n\n\n\ndnssExpectedTimeRatioMinimum\n\n\nSets the minimum time to spend on GC of the nursery area.\n\n\n\n\n\n\nexcessiveGCratio\n \n\n\nSets a boundary value beyond which GC is deemed to be excessive.\n\n\n\n\n\n\nminContractPercent\n \n\n\nSets the minimum percentage of the heap that can be contracted at any given time.\n\n\n\n\n\n\nmaxContractPercent\n \n\n\nSets the maximum percentage of the heap that can be contracted at any given time.\n\n\n\n\n\n\noverrideHiresTimerCheck\n \n\n\nOverrides GC operating system checks for timer resolution.\n\n\n\n\n\n\npreferredHeapBase\n \n\n\nSets a memory range for the Java\u2122 heap. (AIX\u00ae, Linux\u2122, and Windows\u2122 only)\n\n\n\n\n\n\nscvNoAdaptiveTenure\n \n\n\nTurns off the adaptive tenure age in the generational concurrent GC policy.\n\n\n\n\n\n\nscvTenureAge\n \n\n\nSets the initial scavenger tenure age in the generational concurrent GC policy.\n\n\n\n\n\n\nverboseFormat\n \n\n\nSets the verbose GC format.\n\n\n\n\n\n\n\n\nconcurrentScavenge\n\n\n(Linux on Z and z/OS only)\n\n\n -Xgc:concurrentScavenge\n\n\n\n\n\n\n\nThis option is supported only on the 64-bit VM with the Generational Concurrent (\ngencon\n) garbage collection policy. When this mode is enabled, the VM attempts to reduce GC pause-times for response-time sensitive, large heap applications. This option is supported only on IBM z14\u2122 hardware and the following software:\n\n\n\n\nOperating systems:\n\n\n\n\nz/OS V2R3\n\n\nz/OS V2R2 and \nAPAR OA51643\n.\n\n\nRHEL 7.5 (minimum kernel level 4.14)\n\n\nUbuntu 18.04 (minimum kernel level 4.15)\n\n\n\n\nHypervisors:\n\n\n\n\nIBM z/VM 6.4 with \nAPAR VM65987\n\n\nKVM solutions with QEMU 2.10 or later and minimum host kernel level 4.12 (for example, RHEL 7.5 with kernel level 4.14)\n\n\n\n\nIf these requirements are not met, the option is ignored.\n\n\n \nNote:\n On z/OS, the virtual storage used might exceed the Java maximum heap size. Set the z/OS memory limit, specified by \nulimit -M\n, to a larger value than the maximum heap size.\n\n\ndnssExpectedTimeRatioMaximum\n\n\n -Xgc:dnssExpectedTimeRatioMaximum=<value>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nSetting\n\n\nValue\n\n\nDefault\n\n\n\n\n\n\n\n\n\n\n<value>\n\n\n[percentage]\n\n\n5\n\n\n\n\n\n\n\n\n\n\n\n\nThe maximum amount of time spent on garbage collection of the nursery area, expressed as a percentage of the overall time for the last three GC intervals.\n\n\n\n\n\n\ndnssExpectedTimeRatioMinimum\n\n\n -Xgc:dnssExpectedTimeRatioMinimum=<value>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nSetting\n\n\nValue\n\n\nDefault\n\n\n\n\n\n\n\n\n\n\n<value>\n\n\n[percentage]\n\n\n1\n\n\n\n\n\n\n\n\n\n\n\n\nThe minimum amount of time spent on garbage collection of the nursery area, expressed as a percentage of the overall time for the last three GC intervals.\n\n\n\n\n\n\nexcessiveGCratio\n\n\n -Xgc:excessiveGCratio=<value>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nSetting\n\n\nValue\n\n\nDefault\n\n\n\n\n\n\n\n\n\n\n<value>\n\n\n[percentage]\n\n\n95\n\n\n\n\n\n\n\n\n\n\n\n\nwhere \n<value>\n is a percentage of total application run time that is not spent in GC.\n\n\nThe default value is 95, which means that anything over 5% of total application run time spent on GC is deemed excessive. This option can be used only when \n-Xenableexcessivegc\n is set.\n\n\n\n\n\n\nminContractPercent\n\n\n -Xgc:minContractPercent=<n>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nSetting\n\n\nValue\n\n\nDefault\n\n\n\n\n\n\n\n\n\n\n<n>\n\n\n[percentage]\n\n\n-\n\n\n\n\n\n\n\n\n\n\n\n\nThe minimum percentage of the heap that can be contracted at any given time.\n\n\n\n\n\n\nmaxContractPercent\n\n\n -Xgc:maxContractPercent=<n>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nSetting\n\n\nValue\n\n\nDefault\n\n\n\n\n\n\n\n\n\n\n<n>\n\n\n[percentage]\n\n\n-\n\n\n\n\n\n\n\n\n\n\n\n\nThe maximum percentage of the heap that can be contracted at any given time. For example, \n-Xgc:maxContractPercent=20\n causes the heap to contract by as much as 20%.\n\n\n\n\n\n\noverrideHiresTimerCheck\n\n\n -Xgc:overrideHiresTimerCheck\n\n\n\n\n\n\n\n\n\nWhen the VM starts, the GC checks that the operating system can meet the timer resolution requirements for the requested target pause time. Typically, this check correctly identifies operating systems that can deliver adequate time resolution. However, in some cases the operating system provides a more conservative answer than strictly necessary for GC pause time management, which prevents startup. Specifying this parameter causes the GC to ignore the answer returned by the operating system. The VM starts, but GC pause time management remains subject to operating system performance, which might not provide adequate timer resolution.\n\n\n \nNote:\n Use this option with caution, and only when you are unable to use a supported operating system.\n\n\n\n\n\n\npreferredHeapBase\n\n\n(AIX, Linux, Windows only)\n\n\n -Xgc:preferredHeapBase=<address>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nSetting\n\n\nValue\n\n\nDefault\n\n\n\n\n\n\n\n\n\n\n<value>\n\n\n[hexadecimal]\n\n\n-\n\n\n\n\n\n\n\n\n\n\n\n\nwhere, \n<address>\n is the base memory address for the heap. Use this option with the \n-Xcompressedrefs\n option to allocate the heap you specify with the \n-Xmx\n option, in a memory range of your choice. If \n-Xcompressedrefs\n is not specified, this option has no effect. In the following example, the heap is located at the 4 GB mark, leaving the lowest 4 GB of address space for use by other processes.\n\n\n-\nXgc\n:\npreferredHeapBase\n=\n0x100000000\n\n\n\n\n\n\nIf the heap cannot be allocated in a contiguous block at the \npreferredHeapBase\n address you specified, an error occurs detailing a Garbage Collection (GC) allocation failure startup. When the \npreferredHeapBase\n option is used with the \n-Xlp\n option, the \npreferredHeapBase\n address must be a multiple of the large page size. If you specify an inaccurate heap base address, the heap is allocated with the default page size.\n\n\n\n\n\n\nscvNoAdaptiveTenure\n\n\n -Xgc:scvNoAdaptiveTenure\n\n\n\n\n\n\n\nTurns off the adaptive tenure age in the generational concurrent GC policy. The initial age that is set is maintained throughout the run time of the VM. See \nscvTenureAge\n.\n\n\n\n\nscvTenureAge\n\n\n -Xgc:scvTenureAge=<n>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nSetting\n\n\nValue\n\n\nDefault\n\n\n\n\n\n\n\n\n\n\n<n>\n\n\n[1 - 14]\n\n\n10\n\n\n\n\n\n\n\n\n\n\n\n\nSets the initial scavenger tenure age in the generational concurrent GC policy. For more information, see \nTenure age\n.\n\n\n\n\n\n\nverboseFormat\n\n\n -Xgc:verboseFormat=<format>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nSetting\n\n\nValue\n\n\nDefault\n\n\n\n\n\n\n\n\n\n\n<format>\n\n\ndefault\n\n\nyes\n\n\n\n\n\n\n\n\ndeprecated\n\n\n\n\n\n\n\n\n\n\n\n\ndefault\n: The default verbose garbage collection format for OpenJ9. For more information, see \nVerbose garbage collection logging\n.\n\n\ndeprecated\n: The verbose garbage collection format available in Version 6 and earlier releases of the IBM SDK. For more information, see the \nIBM\u00ae SDK, Java Technology Edition, Version 6 Diagnostic Guide\n.",
+ "text": "-Xgc\n\n\nOptions that change the behavior of the Garbage Collector (GC).\n\n\nSyntax\n\n\n -Xgc:<parameter>\n\n\n\n\n\nParameters\n\n\n\n\n\n\n\n\nParameter\n\n\nEffect\n\n\n\n\n\n\n\n\n\n\nconcurrentScavenge\n \n\n\nEnables a garbage collection (GC) mode with less pause times (Linux on IBM Z\u00ae and z/OS\u00ae only).\n\n\n\n\n\n\ndnssExpectedTimeRatioMaximum\n\n\nSets the maximum time to spend on GC of the nursery area.\n\n\n\n\n\n\ndnssExpectedTimeRatioMinimum\n\n\nSets the minimum time to spend on GC of the nursery area.\n\n\n\n\n\n\nexcessiveGCratio\n \n\n\nSets a boundary value beyond which GC is deemed to be excessive.\n\n\n\n\n\n\nminContractPercent\n \n\n\nSets the minimum percentage of the heap that can be contracted at any given time.\n\n\n\n\n\n\nmaxContractPercent\n \n\n\nSets the maximum percentage of the heap that can be contracted at any given time.\n\n\n\n\n\n\noverrideHiresTimerCheck\n \n\n\nOverrides GC operating system checks for timer resolution.\n\n\n\n\n\n\npreferredHeapBase\n \n\n\nSets a memory range for the Java\u2122 heap. (AIX\u00ae, Linux\u2122, and Windows\u2122 only)\n\n\n\n\n\n\nscvNoAdaptiveTenure\n \n\n\nTurns off the adaptive tenure age in the generational concurrent GC policy.\n\n\n\n\n\n\nscvTenureAge\n \n\n\nSets the initial scavenger tenure age in the generational concurrent GC policy.\n\n\n\n\n\n\ntlhIncrementSize\n \n\n\nSets the size of the thread local heap (TLH) increment\n\n\n\n\n\n\ntlhInitialSize\n \n\n\nSets the initial size of the thread local heap\n\n\n\n\n\n\ntlhMaximumSize\n \n\n\nSets the maximum size of the thread local heap\n\n\n\n\n\n\nverboseFormat\n \n\n\nSets the verbose GC format.\n\n\n\n\n\n\n\n\nconcurrentScavenge\n\n\n(Linux on Z and z/OS only)\n\n\n -Xgc:concurrentScavenge\n\n\n\n\n\n\n\nThis option is supported only on the 64-bit VM with the Generational Concurrent (\ngencon\n) garbage collection policy. When this mode is enabled, the VM attempts to reduce GC pause-times for response-time sensitive, large heap applications. This option is supported only on IBM z14\u2122 hardware and the following software:\n\n\n\n\nOperating systems:\n\n\n\n\nz/OS V2R3\n\n\nz/OS V2R2 and \nAPAR OA51643\n.\n\n\nRHEL 7.5 (minimum kernel level 4.14)\n\n\nUbuntu 18.04 (minimum kernel level 4.15)\n\n\n\n\nHypervisors:\n\n\n\n\nIBM z/VM 6.4 with \nAPAR VM65987\n\n\nKVM solutions with QEMU 2.10 or later and minimum host kernel level 4.12 (for example, RHEL 7.5 with kernel level 4.14)\n\n\n\n\nIf these requirements are not met, the option is ignored.\n\n\n \nNote:\n On z/OS, the virtual storage used might exceed the Java maximum heap size. Set the z/OS memory limit, specified by \nulimit -M\n, to a larger value than the maximum heap size.\n\n\ndnssExpectedTimeRatioMaximum\n\n\n -Xgc:dnssExpectedTimeRatioMaximum=<value>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nSetting\n\n\nValue\n\n\nDefault\n\n\n\n\n\n\n\n\n\n\n<value>\n\n\n[percentage]\n\n\n5\n\n\n\n\n\n\n\n\n\n\n\n\nThe maximum amount of time spent on garbage collection of the nursery area, expressed as a percentage of the overall time for the last three GC intervals.\n\n\n\n\n\n\ndnssExpectedTimeRatioMinimum\n\n\n -Xgc:dnssExpectedTimeRatioMinimum=<value>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nSetting\n\n\nValue\n\n\nDefault\n\n\n\n\n\n\n\n\n\n\n<value>\n\n\n[percentage]\n\n\n1\n\n\n\n\n\n\n\n\n\n\n\n\nThe minimum amount of time spent on garbage collection of the nursery area, expressed as a percentage of the overall time for the last three GC intervals.\n\n\n\n\n\n\nexcessiveGCratio\n\n\n -Xgc:excessiveGCratio=<value>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nSetting\n\n\nValue\n\n\nDefault\n\n\n\n\n\n\n\n\n\n\n<value>\n\n\n[percentage]\n\n\n95\n\n\n\n\n\n\n\n\n\n\n\n\nwhere \n<value>\n is a percentage of total application run time that is not spent in GC.\n\n\nThe default value is 95, which means that anything over 5% of total application run time spent on GC is deemed excessive. This option can be used only when \n-Xenableexcessivegc\n is set.\n\n\n\n\n\n\nminContractPercent\n\n\n -Xgc:minContractPercent=<n>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nSetting\n\n\nValue\n\n\nDefault\n\n\n\n\n\n\n\n\n\n\n<n>\n\n\n[percentage]\n\n\n-\n\n\n\n\n\n\n\n\n\n\n\n\nThe minimum percentage of the heap that can be contracted at any given time.\n\n\n\n\n\n\nmaxContractPercent\n\n\n -Xgc:maxContractPercent=<n>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nSetting\n\n\nValue\n\n\nDefault\n\n\n\n\n\n\n\n\n\n\n<n>\n\n\n[percentage]\n\n\n-\n\n\n\n\n\n\n\n\n\n\n\n\nThe maximum percentage of the heap that can be contracted at any given time. For example, \n-Xgc:maxContractPercent=20\n causes the heap to contract by as much as 20%.\n\n\n\n\n\n\noverrideHiresTimerCheck\n\n\n -Xgc:overrideHiresTimerCheck\n\n\n\n\n\n\n\n\n\nWhen the VM starts, the GC checks that the operating system can meet the timer resolution requirements for the requested target pause time. Typically, this check correctly identifies operating systems that can deliver adequate time resolution. However, in some cases the operating system provides a more conservative answer than strictly necessary for GC pause time management, which prevents startup. Specifying this parameter causes the GC to ignore the answer returned by the operating system. The VM starts, but GC pause time management remains subject to operating system performance, which might not provide adequate timer resolution.\n\n\n \nNote:\n Use this option with caution, and only when you are unable to use a supported operating system.\n\n\n\n\n\n\npreferredHeapBase\n\n\n(AIX, Linux, Windows only)\n\n\n -Xgc:preferredHeapBase=<address>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nSetting\n\n\nValue\n\n\nDefault\n\n\n\n\n\n\n\n\n\n\n<value>\n\n\n[hexadecimal]\n\n\n-\n\n\n\n\n\n\n\n\n\n\n\n\nwhere, \n<address>\n is the base memory address for the heap. Use this option with the \n-Xcompressedrefs\n option to allocate the heap you specify with the \n-Xmx\n option, in a memory range of your choice. If \n-Xcompressedrefs\n is not specified, this option has no effect. In the following example, the heap is located at the 4 GB mark, leaving the lowest 4 GB of address space for use by other processes.\n\n\n-\nXgc\n:\npreferredHeapBase\n=\n0x100000000\n\n\n\n\n\n\nIf the heap cannot be allocated in a contiguous block at the \npreferredHeapBase\n address you specified, an error occurs detailing a Garbage Collection (GC) allocation failure startup. When the \npreferredHeapBase\n option is used with the \n-Xlp\n option, the \npreferredHeapBase\n address must be a multiple of the large page size. If you specify an inaccurate heap base address, the heap is allocated with the default page size.\n\n\n\n\n\n\nscvNoAdaptiveTenure\n\n\n -Xgc:scvNoAdaptiveTenure\n\n\n\n\n\n\n\nTurns off the adaptive tenure age in the generational concurrent GC policy. The initial age that is set is maintained throughout the run time of the VM. See \nscvTenureAge\n.\n\n\n\n\nscvTenureAge\n\n\n -Xgc:scvTenureAge=<n>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nSetting\n\n\nValue\n\n\nDefault\n\n\n\n\n\n\n\n\n\n\n<n>\n\n\n[1 - 14]\n\n\n10\n\n\n\n\n\n\n\n\n\n\n\n\nSets the initial scavenger tenure age in the generational concurrent GC policy. For more information, see \nTenure age\n.\n\n\n\n\n\n\ntlhIncrementSize\n\n\n -Xgc:tlhIncrementSize=<bytes>\n\n\n\n\n\n\n\nSets the increment size of the thread local heap (TLH), which plays a key role in cache allocation. Threads start creating TLHs with a predefined initial size (default 2 KB). On every TLH refresh, the requested size for that thread is increased by an increment (default 4 KB). Use this option to control the increment size.\n\n\n\n\ntlhInitialSize\n\n\n -Xgc:tlhInitialSize=<bytes>\n\n\n\n\n\n\n\nSets the initial size of the TLH. The default size is 2 KB.\n\n\n\n\ntlhMaximumSize\n\n\n -Xgc:tlhMaximumSize=<bytes>\n\n\n\n\n\n\n\nSets the maximum size of the TLH. The size of the TLH varies from 512 bytes (768 on 64-bit JVMs) to 128 KB, depending on the allocation rate of the thread.\nLarger TLHs can help reduce heap lock contention, but might also reduce heap utilisation and increase heap fragmentation. Typically, when the maximum TLH size is increased, you should also increase the increment size (\n-XtlhIncrementSize\n) proportionally, so that active threads can reach the maximum requested TLH size more quickly.\n\n\n\n\nverboseFormat\n\n\n -Xgc:verboseFormat=<format>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nSetting\n\n\nValue\n\n\nDefault\n\n\n\n\n\n\n\n\n\n\n<format>\n\n\ndefault\n\n\nyes\n\n\n\n\n\n\n\n\ndeprecated\n\n\n\n\n\n\n\n\n\n\n\n\ndefault\n: The default verbose garbage collection format for OpenJ9. For more information, see \nVerbose garbage collection logging\n.\n\n\ndeprecated\n: The verbose garbage collection format available in Version 6 and earlier releases of the IBM SDK. For more information, see the \nIBM\u00ae SDK, Java Technology Edition, Version 6 Diagnostic Guide\n.",
"title": "-Xgc"
},
{
@@ -1582,7 +1582,7 @@
},
{
"location": "/xgc/#parameters",
- "text": "Parameter Effect concurrentScavenge Enables a garbage collection (GC) mode with less pause times (Linux on IBM Z\u00ae and z/OS\u00ae only). dnssExpectedTimeRatioMaximum Sets the maximum time to spend on GC of the nursery area. dnssExpectedTimeRatioMinimum Sets the minimum time to spend on GC of the nursery area. excessiveGCratio Sets a boundary value beyond which GC is deemed to be excessive. minContractPercent Sets the minimum percentage of the heap that can be contracted at any given time. maxContractPercent Sets the maximum percentage of the heap that can be contracted at any given time. overrideHiresTimerCheck Overrides GC operating system checks for timer resolution. preferredHeapBase Sets a memory range for the Java\u2122 heap. (AIX\u00ae, Linux\u2122, and Windows\u2122 only) scvNoAdaptiveTenure Turns off the adaptive tenure age in the generational concurrent GC policy. scvTenureAge Sets the initial scavenger tenure age in the generational concurrent GC policy. verboseFormat Sets the verbose GC format.",
+ "text": "Parameter Effect concurrentScavenge Enables a garbage collection (GC) mode with less pause times (Linux on IBM Z\u00ae and z/OS\u00ae only). dnssExpectedTimeRatioMaximum Sets the maximum time to spend on GC of the nursery area. dnssExpectedTimeRatioMinimum Sets the minimum time to spend on GC of the nursery area. excessiveGCratio Sets a boundary value beyond which GC is deemed to be excessive. minContractPercent Sets the minimum percentage of the heap that can be contracted at any given time. maxContractPercent Sets the maximum percentage of the heap that can be contracted at any given time. overrideHiresTimerCheck Overrides GC operating system checks for timer resolution. preferredHeapBase Sets a memory range for the Java\u2122 heap. (AIX\u00ae, Linux\u2122, and Windows\u2122 only) scvNoAdaptiveTenure Turns off the adaptive tenure age in the generational concurrent GC policy. scvTenureAge Sets the initial scavenger tenure age in the generational concurrent GC policy. tlhIncrementSize Sets the size of the thread local heap (TLH) increment tlhInitialSize Sets the initial size of the thread local heap tlhMaximumSize Sets the maximum size of the thread local heap verboseFormat Sets the verbose GC format.",
"title": "Parameters"
},
{
@@ -1636,6 +1636,21 @@
"title": "scvTenureAge"
},
{
+ "location": "/xgc/#tlhincrementsize",
+ "text": "-Xgc:tlhIncrementSize=<bytes> Sets the increment size of the thread local heap (TLH), which plays a key role in cache allocation. Threads start creating TLHs with a predefined initial size (default 2 KB). On every TLH refresh, the requested size for that thread is increased by an increment (default 4 KB). Use this option to control the increment size.",
+ "title": "tlhIncrementSize"
+ },
+ {
+ "location": "/xgc/#tlhinitialsize",
+ "text": "-Xgc:tlhInitialSize=<bytes> Sets the initial size of the TLH. The default size is 2 KB.",
+ "title": "tlhInitialSize"
+ },
+ {
+ "location": "/xgc/#tlhmaximumsize",
+ "text": "-Xgc:tlhMaximumSize=<bytes> Sets the maximum size of the TLH. The size of the TLH varies from 512 bytes (768 on 64-bit JVMs) to 128 KB, depending on the allocation rate of the thread.\nLarger TLHs can help reduce heap lock contention, but might also reduce heap utilisation and increase heap fragmentation. Typically, when the maximum TLH size is increased, you should also increase the increment size ( -XtlhIncrementSize ) proportionally, so that active threads can reach the maximum requested TLH size more quickly.",
+ "title": "tlhMaximumSize"
+ },
+ {
"location": "/xgc/#verboseformat",
"text": "-Xgc:verboseFormat=<format> Setting Value Default <format> default yes deprecated default : The default verbose garbage collection format for OpenJ9. For more information, see Verbose garbage collection logging . deprecated : The verbose garbage collection format available in Version 6 and earlier releases of the IBM SDK. For more information, see the IBM\u00ae SDK, Java Technology Edition, Version 6 Diagnostic Guide .",
"title": "verboseFormat"
@@ -2032,12 +2047,12 @@
},
{
"location": "/xlockreservation/",
- "text": "-XlockReservation\n\n\n(AIX\u00ae & Windows\u2122 only)\n\n\nEnables an optimization that presumes a monitor is owned by the thread that last acquired it.\n\n\nThis optimization minimizes the runtime cost of acquiring and releasing a monitor for a single thread if the monitor is rarely acquired by multiple threads.\n\n\nSyntax\n\n\n -XlockReservation",
+ "text": "-XlockReservation\n\n\nEnables an optimization that presumes a monitor is owned by the thread that last acquired it.\n\n\nThis optimization minimizes the runtime cost of acquiring and releasing a monitor for a single thread if the monitor is rarely acquired by multiple threads.\n\n\nSyntax\n\n\n -XlockReservation",
"title": "-XlockReservation"
},
{
"location": "/xlockreservation/#-xlockreservation",
- "text": "(AIX\u00ae & Windows\u2122 only) Enables an optimization that presumes a monitor is owned by the thread that last acquired it. This optimization minimizes the runtime cost of acquiring and releasing a monitor for a single thread if the monitor is rarely acquired by multiple threads.",
+ "text": "Enables an optimization that presumes a monitor is owned by the thread that last acquired it. This optimization minimizes the runtime cost of acquiring and releasing a monitor for a single thread if the monitor is rarely acquired by multiple threads.",
"title": "-XlockReservation"
},
{
diff --git a/sitemap.xml b/sitemap.xml
index c15f812..5c5b3a6 100644
--- a/sitemap.xml
+++ b/sitemap.xml
@@ -4,7 +4,7 @@
<url>
<loc>https://www.eclipse.org/openj9/docs/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
@@ -13,13 +13,13 @@
<url>
<loc>https://www.eclipse.org/openj9/docs/version0.9/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://www.eclipse.org/openj9/docs/version0.8/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
@@ -28,7 +28,7 @@
<url>
<loc>https://www.eclipse.org/openj9/docs/gc/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
@@ -36,7 +36,7 @@
<url>
<loc>https://www.eclipse.org/openj9/docs/jit/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
@@ -44,7 +44,7 @@
<url>
<loc>https://www.eclipse.org/openj9/docs/aot/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
@@ -52,7 +52,7 @@
<url>
<loc>https://www.eclipse.org/openj9/docs/shrc/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
@@ -61,25 +61,25 @@
<url>
<loc>https://www.eclipse.org/openj9/docs/diag_overview/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://www.eclipse.org/openj9/docs/dump_javadump/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://www.eclipse.org/openj9/docs/dump_heapdump/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://www.eclipse.org/openj9/docs/dump_systemdump/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
@@ -89,19 +89,19 @@
<url>
<loc>https://www.eclipse.org/openj9/docs/cmdline_specifying/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://www.eclipse.org/openj9/docs/cmdline_general/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://www.eclipse.org/openj9/docs/cmdline_migration/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
@@ -129,19 +129,19 @@
<url>
<loc>https://www.eclipse.org/openj9/docs/tool_jdmpview/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://www.eclipse.org/openj9/docs/tool_traceformat/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://www.eclipse.org/openj9/docs/tool_builder/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
@@ -151,31 +151,31 @@
<url>
<loc>https://www.eclipse.org/openj9/docs/openj9_support/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://www.eclipse.org/openj9/docs/openj9_defaults/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://www.eclipse.org/openj9/docs/openj9_directories/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://www.eclipse.org/openj9/docs/messages_intro/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://www.eclipse.org/openj9/docs/env_var/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
@@ -184,7 +184,7 @@
<url>
<loc>https://www.eclipse.org/openj9/docs/legal/</loc>
- <lastmod>2018-09-26</lastmod>
+ <lastmod>2018-10-03</lastmod>
<changefreq>daily</changefreq>
</url>
diff --git a/xgc/index.html b/xgc/index.html
index d72e7ac..6264155 100644
--- a/xgc/index.html
+++ b/xgc/index.html
@@ -1229,6 +1229,27 @@
</li>
<li class="md-nav__item">
+ <a href="#tlhincrementsize" title="tlhIncrementSize" class="md-nav__link">
+ tlhIncrementSize
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#tlhinitialsize" title="tlhInitialSize" class="md-nav__link">
+ tlhInitialSize
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#tlhmaximumsize" title="tlhMaximumSize" class="md-nav__link">
+ tlhMaximumSize
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
<a href="#verboseformat" title="verboseFormat" class="md-nav__link">
verboseFormat
</a>
@@ -2915,6 +2936,27 @@
</li>
<li class="md-nav__item">
+ <a href="#tlhincrementsize" title="tlhIncrementSize" class="md-nav__link">
+ tlhIncrementSize
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#tlhinitialsize" title="tlhInitialSize" class="md-nav__link">
+ tlhInitialSize
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
+ <a href="#tlhmaximumsize" title="tlhMaximumSize" class="md-nav__link">
+ tlhMaximumSize
+ </a>
+
+</li>
+
+ <li class="md-nav__item">
<a href="#verboseformat" title="verboseFormat" class="md-nav__link">
verboseFormat
</a>
@@ -3028,6 +3070,18 @@
<td>Sets the initial scavenger tenure age in the generational concurrent GC policy.</td>
</tr>
<tr>
+<td><a href="#tlhincrementsize"><code>tlhIncrementSize</code> </a></td>
+<td>Sets the size of the thread local heap (TLH) increment</td>
+</tr>
+<tr>
+<td><a href="#tlhinitialsize"><code>tlhInitialSize</code> </a></td>
+<td>Sets the initial size of the thread local heap</td>
+</tr>
+<tr>
+<td><a href="#tlhmaximumsize"><code>tlhMaximumSize</code> </a></td>
+<td>Sets the maximum size of the thread local heap</td>
+</tr>
+<tr>
<td><a href="#verboseformat"><code>verboseFormat</code> </a></td>
<td>Sets the verbose GC format.</td>
</tr>
@@ -3278,6 +3332,31 @@
<p>Sets the initial scavenger tenure age in the generational concurrent GC policy. For more information, see <a href="https://www.ibm.com/support/knowledgecenter/SSYKE2_8.0.0/com.ibm.java.vm.80.doc/docs/mm_gc_generational_tenure.html">Tenure age</a>.</p>
</dd>
</dl>
+<h3 id="tlhincrementsize"><code>tlhIncrementSize</code></h3>
+<div class="codehilite"><pre><span></span> -Xgc:tlhIncrementSize=<bytes>
+</pre></div>
+
+
+<dl>
+<dd>Sets the increment size of the thread local heap (TLH), which plays a key role in cache allocation. Threads start creating TLHs with a predefined initial size (default 2 KB). On every TLH refresh, the requested size for that thread is increased by an increment (default 4 KB). Use this option to control the increment size.</dd>
+</dl>
+<h3 id="tlhinitialsize"><code>tlhInitialSize</code></h3>
+<div class="codehilite"><pre><span></span> -Xgc:tlhInitialSize=<bytes>
+</pre></div>
+
+
+<dl>
+<dd>Sets the initial size of the TLH. The default size is 2 KB.</dd>
+</dl>
+<h3 id="tlhmaximumsize"><code>tlhMaximumSize</code></h3>
+<div class="codehilite"><pre><span></span> -Xgc:tlhMaximumSize=<bytes>
+</pre></div>
+
+
+<dl>
+<dd>Sets the maximum size of the TLH. The size of the TLH varies from 512 bytes (768 on 64-bit JVMs) to 128 KB, depending on the allocation rate of the thread.
+Larger TLHs can help reduce heap lock contention, but might also reduce heap utilisation and increase heap fragmentation. Typically, when the maximum TLH size is increased, you should also increase the increment size (<code>-XtlhIncrementSize</code>) proportionally, so that active threads can reach the maximum requested TLH size more quickly.</dd>
+</dl>
<h3 id="verboseformat"><code>verboseFormat</code></h3>
<div class="codehilite"><pre><span></span> -Xgc:verboseFormat=<format>
</pre></div>
diff --git a/xlockreservation/index.html b/xlockreservation/index.html
index 769f14d..ec842e4 100644
--- a/xlockreservation/index.html
+++ b/xlockreservation/index.html
@@ -2792,7 +2792,6 @@
-->
<h1 id="-xlockreservation">-XlockReservation</h1>
-<p><strong>(AIX® & Windows™ only)</strong></p>
<p>Enables an optimization that presumes a monitor is owned by the thread that last acquired it.</p>
<p>This optimization minimizes the runtime cost of acquiring and releasing a monitor for a single thread if the monitor is rarely acquired by multiple threads.</p>
<h2 id="syntax">Syntax</h2>
