[Gate-users] Gate under-utilizing cpu

[Stathis Kamperis]

Hi Simon,

thanks for your answer. I was puzzled not because it was slow, but
because it was not utilizing 100% of the CPU. Judging from the stack
trace, it appears that Gate is blocking on something, wait()'ing for
something to happen with relation to the graphics subsystem.

Thanks!

Best regards,
Stathis

On Tue, Mar 4, 2014 at 4:19 PM, Simon Stute <gate.stute at gmail.com> wrote:
> Hi,
>
> The answer is in your email, disable the visualization, it is several
> thousands times slower with visualization.
>
> Cheers,
> Simon
>
>
> On Tue, Mar 4, 2014 at 3:13 PM, Stathis Kamperis <ekamperi at gmail.com> wrote:
>>
>> I didn't know that linux has pstack, so here is sampled stack trace
>> when Gate gets lazy:
>> (I will try to disable the graphics output)
>>
>> % pstack `pgrep Gate`
>> #0  0x0000003b414eb7e0 in __poll_nocancel () from /lib64/libc.so.6
>> #1  0x0000003b44c09f42 in _xcb_conn_wait () from /lib64/libxcb.so.1
>> #2  0x0000003b44c0b37f in wait_for_reply () from /lib64/libxcb.so.1
>> #3  0x0000003b44c0b492 in xcb_wait_for_reply () from /lib64/libxcb.so.1
>> #4  0x0000003b45041b47 in _XReply () from /lib64/libX11.so.6
>> #5  0x000000387c641373 in DRI2GetBuffersWithFormat () from
>> /lib64/libGL.so.1
>> #6  0x000000387c63ee6b in dri2GetBuffersWithFormat () from
>> /lib64/libGL.so.1
>> #7  0x00007f84287e3ebd in intel_update_renderbuffers () from
>> /usr/lib64/dri/i965_dri.so
>> #8  0x00007f84287e41c3 in intel_prepare_render () from
>> /usr/lib64/dri/i965_dri.so
>> #9  0x00007f84287f72c7 in brw_clear () from /usr/lib64/dri/i965_dri.so
>> #10 0x00007f84327a5423 in G4OpenGLViewer::ClearView() () from
>> /usr/local/lib64/libG4OpenGL.so
>> #11 0x00007f84327bbb50 in G4OpenGLStoredXViewer::ShowView() () from
>> /usr/local/lib64/libG4OpenGL.so
>> #12 0x00007f843233570a in G4VisManager::EndOfEvent() () from
>> /usr/local/lib64/libG4vis_management.so
>> #13 0x00007f843234107d in
>> G4VisStateDependent::Notify(G4ApplicationState) () from
>> /usr/local/lib64/libG4vis_management.so
>> #14 0x00007f842dad38e1 in
>> G4StateManager::SetNewState(G4ApplicationState, char const*) () from
>> /usr/local/lib64/libG4global.so
>> #15 0x00007f8430c992c6 in G4EventManager::DoProcessing(G4Event*) ()
>> from /usr/local/lib64/libG4event.so
>> #16 0x00007f8430f0025a in G4RunManager::DoEventLoop(int, char const*,
>> int) () from /usr/local/lib64/libG4run.so
>> #17 0x00007f8430effc2c in G4RunManager::BeamOn(int, char const*, int)
>> () from /usr/local/lib64/libG4run.so
>> #18 0x000000000075e5ce in GateApplicationMgr::StartDAQ() ()
>> #19 0x00000000007954a0 in
>> GateApplicationMgrMessenger::SetNewValue(G4UIcommand*, G4String) ()
>> #20 0x00007f842dd0a08f in G4UIcommand::DoIt(G4String) () from
>> /usr/local/lib64/libG4intercoms.so
>>
>> On Tue, Mar 4, 2014 at 4:09 PM, Stathis Kamperis <ekamperi at gmail.com>
>> wrote:
>> > Hi people,
>> >
>> > I've noticed that when I run a simulation top(1) says that Gate uses
>> > only a small fraction of my CPU, e.g.:
>> >
>> > 19132 stathis   20   0  370436  60968  32660 S   2.7  0.7   0:07.22 Gate
>> >
>> > (2.7% here).
>> >
>> > Has anyone else seen this ?
>> >
>> > Best regards,
>> > Stathis
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>