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add randomness to garbage collection

This commit is contained in:
Jan Steemann 2015-07-14 13:51:57 +02:00
parent 2983f4e987
commit 8ea97817a1
1 changed files with 7 additions and 2 deletions
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9
arangod/V8Server/ApplicationV8.cpp
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@ -511,7 +511,8 @@ void ApplicationV8::exitContext (V8Context* context) {
performGarbageCollection = true; performGarbageCollection = true;
} }
if (performGarbageCollection) { if (performGarbageCollection && ! _freeContexts[name].empty()) {
// only add the context to the dirty list if there is at least one other free context
_dirtyContexts[name].emplace_back(context); _dirtyContexts[name].emplace_back(context);
} }
else { else {
@ -1408,11 +1409,15 @@ bool ApplicationV8::prepareV8Instance (const string& name, size_t i, bool useAct
isolate->Exit(); isolate->Exit();
delete context->_locker; delete context->_locker;
context->_locker = nullptr; context->_locker = nullptr;
// some random delay value to add as an initial garbage collection offset
// this avoids collecting all contexts at the very same time
double const randomWait = fmod(static_cast<double>(TRI_UInt32Random()), 15.0);
// initialise garbage collection for context // initialise garbage collection for context
context->_numExecutions = 0; context->_numExecutions = 0;
context->_hasActiveExternals = true; context->_hasActiveExternals = true;
context->_lastGcStamp = TRI_microtime(); context->_lastGcStamp = TRI_microtime() + randomWait;
LOG_TRACE("initialised V8 context #%d", (int) i); LOG_TRACE("initialised V8 context #%d", (int) i);