I have an app where in I call a function in Javascript repeatedly.
When doing this the app gradually consumes memory. It seems if the
app keeps running there is no limit to the amount of memory that will
eventually be consumed. I have tried tinkering with forcing garbage
collection to no great affect. I checked out a fresh copy of trunk
this morning (Revision: 5173)
After each call I am doing this:
static int cycle = 0;
++cycle;
if(!(cycle % 10000))
{
int precount = V8HashCount;
while(!V8::IdleNotification()) ;
V8::LowMemoryNotification();
HeapStatistics hs;
V8::GetHeapStatistics(&hs);
TRACE("Internal GC V8HashCount:%d-->%d v8heap:%.2f/%.2f
MB",precount, V8HashCount,hs.used_heap_size() / 1024.0 / 1024.0
,hs.total_heap_size() / 1024.0 / 1024.0);
}
And at the end:
int precount = V8HashCount;
V8::ContextDisposedNotification();
V8::LowMemoryNotification();
while(!V8::IdleNotification()) ;
V8::LowMemoryNotification();
HeapStatistics hs;
V8::GetHeapStatistics(&hs);
TRACE("Final GC V8HashCount:%d-->%d v8heap:%.2f/%.2f MB",precount,
V8HashCount,hs.used_heap_size() / 1024.0 / 1024.0
,hs.total_heap_size() / 1024.0 / 1024.0);
FYI: V8HashCount is a count of objects passed into V8 with a weak
handle that have not yet been destroyed.
Here is the output I get for a run of 100K iterations.
8/4/2010 10:57:04 Internal GC V8HashCount:2575-->6 v8heap:10.43/11.65 MB
8/4/2010 10:57:26 Internal GC V8HashCount:6953-->6 v8heap:19.67/21.00 MB
8/4/2010 10:57:49 Internal GC V8HashCount:4337-->6 v8heap:28.90/30.22 MB
8/4/2010 10:58:12 Internal GC V8HashCount:449-->6 v8heap:38.13/39.32 MB
8/4/2010 10:58:36 Internal GC V8HashCount:4170-->6 v8heap:47.36/48.66 MB
8/4/2010 10:58:59 Internal GC V8HashCount:18989-->6 v8heap:56.59/57.88 MB
8/4/2010 10:59:24 Internal GC V8HashCount:4063-->6 v8heap:65.82/67.22 MB
8/4/2010 10:59:48 Internal GC V8HashCount:9617-->6 v8heap:75.06/76.33 MB
8/4/2010 11:00:14 Internal GC V8HashCount:30125-->6 v8heap:84.29/85.55 MB
8/4/2010 11:00:39 Internal GC V8HashCount:20922-->6 v8heap:93.52/94.89 MB
8/4/2010 11:00:42 Final GC V8HashCount:18-->0 v8heap:93.16/94.56 MB
It seems like garbage collection is working but memory is still leaking.
I need to address this because in production this code will be
expected to run continuously and handle around 4 million cycles per
day.
--
Bryan White
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