I am trying to figure out why GraphicsMagick is observed to run slower
under OpenIndiana on a dual Intel Xeon E5 system (16 core) with 128GB
RAM than on Linux on a slower-clocked prior generation Xeon (E5649).
Speed differences of a factor of two have been seen. The application
is linked with libumem (which helped performance). It does not seem
to matter if the program is built single-threaded or uses threads.
While I doubt that the Spot profiler is running entirely correctly, I
noticed that it mentioned vmem_hash_delete (seems to be from
blob/master/usr/src/uts/common/os/vmem.c in illumos-gate) as the #2
high-runner. This is described as "Remove vsp from the
allocated-segment hash table and update kstats.".
Functions sorted by metric: Exclusive User CPU Time
Excl. Incl. Excl. Excl. Excl. Excl. Bit Name
User CPU User CPU Sys. CPU Wall Bit Func Inst Exec
sec. sec. sec. sec. Count
6.264 6.264 3.082 9.347 8342907 29445501700 <Total>
5.924 6.034 2.992 8.916 717 29151595095 [trimmed]
DecodeImage src Caller-callee
0.170 0.170 0. 0.170 0 0 [trimmed]
vmem_hash_delete Caller-callee
0.030 0.030 0. 0.030 369762 44882862 [trimmed] ReadBlob
Caller-callee
0.030 0.030 0.080 0.110 0 0 [trimmed] memcpy
Caller-callee
Notice that the program consumed 9.347 of wall-clock seconds but only
6.264 seconds of user CPU even though it should be CPU bound.
However, the program does allocate 5GB of memory.
Linux:
time ./magick large.gif
./magick large.gif 4.21s user 1.89s system 98% cpu 6.179 total
OpenIndiana:
% time ./magick large.gif
./magick large.gif 5.87s user 3.63s system 85% cpu 11.105 total
It bothers me that GraphicsMagick has principly been developed and
tuned on Solaris yet I see it performing poorly under OpenIndiana vs
Linux.
Any ideas for the best way to diagnose?
Bob
--
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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