I analysed node-0.6.10/windows2008r2 running my clustered http server
script in VTune with a view to understanding why node took 50% more CPU
than nginx/apache for a given scenario. The results indicate that
GetQueuedCompletionStatusEx takes 40% of CPU. Does this make sense?
I was wondering if the reported stacks are meaningful for a HTTP server
script that pipes the contents of a static file as response to all requests
coming over 1000's of concurrent connections. Are there really any
exceptions and buffer initializations as shown?
Call Stack Time Total Module Function (Full)
Total [Unknown] 100.0%
v8::V8::GetCompressedStartupDataAlgorithm 0s 92.2% node.exe
v8::V8::GetCompressedStartupDataAlgorithm(void)
RtlInitializeExceptionChain 0s 92.2% ntdll.dll
RtlInitializeExceptionChain
RtlInitializeExceptionChain 0s 92.2% ntdll.dll
RtlInitializeExceptionChain
BaseThreadInitThunk 0s 92.2% kernel32.dll BaseThreadInitThunk
v8::V8::GetCompressedStartupDataAlgorithm 0s 92.2% node.exe
v8::V8::GetCompressedStartupDataAlgorithm(void)
node::Buffer::Initialize 0s 92.2% node.exe
node::Buffer::Initialize(class
v8::Handle<class v8::Object>)
node::FatalException 0s 90.5% node.exe node::FatalException(class
v8::TryCatch &)
uv_unref 0.015s 41.4% node.exe uv_unref
GetQueuedCompletionStatusEx 0.292s 41.4% KERNELBASE.dll
GetQueuedCompletionStatusEx
NtRemoveIoCompletionEx 180.77s 41.4% ntdll.dll
NtRemoveIoCompletionEx
IsNLSDefinedString 0.017s 0.0% KERNELBASE.dll
IsNLSDefinedString
uv_timer_get_repeat 0.025s 0.0% node.exe
uv_timer_get_repeat
[Unknown stack frame(s)] 0s 37.1% [Unknown] [Unknown stack
frame(s)]
node::Buffer::Initialize 0.955s 16.3% node.exe
node::Buffer::Initialize(class
v8::Handle<class v8::Object>)
uv_write 0.181s 10.1% node.exe uv_write
uv_tcp_getpeername 0.332s 10.1% node.exe
uv_tcp_getpeername
WSASend 0.179s 9.9% WS2_32.dll WSASend
[mswsock.dll] 0.397s 9.6% mswsock.dll
[mswsock.dll]
NtDeviceIoControlFile 41.577s 9.5% ntdll.dll
NtDeviceIoControlFile
For readability here are some stacks that correspond to the busy data:
ntdll.dll!NtRemoveIoCompletionEx - [Unknown]
KERNELBASE.dll!GetQueuedCompletionStatusEx+0x7790 - [Unknown]
node.exe!uv_unref+0x4ec35 - [Unknown]
node.exe!node::FatalException(class v8::TryCatch &)+0x1afb7 - [Unknown]
node.exe!node::Buffer::Initialize(class v8::Handle<class
v8::Object>)+0x2b0ed - [Unknown]
node.exe!v8::V8::GetCompressedStartupDataAlgorithm(void)+0x298759 -
[Unknown]
kernel32.dll!BaseThreadInitThunk+0x13399 - [Unknown]
ntdll.dll!RtlInitializeExceptionChain+0x39ef1 - [Unknown]
ntdll.dll!RtlInitializeExceptionChain+0x39ec4 - [Unknown]
node.exe!v8::V8::GetCompressedStartupDataAlgorithm(void)+0x2987af -
[Unknown]
ntdll.dll!NtDeviceIoControlFile - [Unknown]
mswsock.dll![mswsock.dll]+0x44f3 - [Unknown]
WS2_32.dll!WSASend+0x447e - [Unknown]
node.exe!uv_tcp_getpeername+0x5d7b6 - [Unknown]
node.exe!uv_write+0x52e0f - [Unknown]
node.exe!node::Buffer::Initialize(class v8::Handle<class
v8::Object>)+0x2bcdd - [Unknown]
[Unknown]![Unknown stack frame(s)]+0x0 - [Unknown]
node.exe!node::FatalException(class v8::TryCatch &)+0x1afb7 - [Unknown]
node.exe!node::Buffer::Initialize(class v8::Handle<class
v8::Object>)+0x2b0ed - [Unknown]
node.exe!v8::V8::GetCompressedStartupDataAlgorithm(void)+0x298759 -
[Unknown]
kernel32.dll!BaseThreadInitThunk+0x13399 - [Unknown]
ntdll.dll!RtlInitializeExceptionChain+0x39ef1 - [Unknown]
ntdll.dll!RtlInitializeExceptionChain+0x39ec4 - [Unknown]
node.exe!v8::V8::GetCompressedStartupDataAlgorithm(void)+0x2987af -
[Unknown]
--
--
Job Board: http://jobs.nodejs.org/
Posting guidelines:
https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines
You received this message because you are subscribed to the Google
Groups "nodejs" group.
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/nodejs?hl=en?hl=en
