Legacy ImageMagick Discussions Archive

So, I set up a new computer, same specs as an old one, but it's lagging a lot. I ran a few benchmarks, and you can see here:

system 1# time convert rose: -resize 5000x5000 -bench 5 /tmp/rose.png
Performance: 5i 0.221729ips 26.050u 0:22.549

real 0m22.554s
user 0m25.795s
sys 0m0.262s

system 2#time convert rose: -resize 5000x5000 -bench 5 /tmp/rose.png
Performance: 5i 0.220167ips 28.710u 0:22.710

real 0m22.731s
user 0m25.553s
sys 0m3.172s

While the overall time is about the same.. The sys time (time spent in kernel) is over 10 times as long.

I believe this may have something to do with the sluggishness.. so, I'm wondering if any of you had advise on where to begin to figure this out.

Verify the specs are the same. Type

convert -list configure
convert -list resource

and compare the results. Try a single threaded instance of ImageMagick:

export MAGICK_THREAD_LIMIT=1

Verify with

convert -list resource

Threads should be 1. Now type

time convert rose: -resize 5000x5000 -bench 5 /tmp/rose.png

IM is exact same version.

thread limit doesn't seem to change sys time at all.

Wait.. the limit didn't take.

# export MAGICK_THREAD_LIMIT=1
# convert -list resource
File Area Memory Map Disk Thread Time
-------------------------------------------------------------------------------
768 8.1252GB 5.6754GiB 15.134GiB 18.446744EB 8 unlimited

# set | grep MAGIC
MAGICK_THREAD_LIMIT=1

We're using tcsh and get the expected results:

Code: Select all

-> convert -list resource
File         Area       Memory          Map         Disk    Thread         Time
-------------------------------------------------------------------------------
48000      782.8MB    5.8323GiB    11.665GiB    unlimited         8    unlimited


-> setenv MAGICK_THREAD_LIMIT 1

-> convert -list resource
File         Area       Memory          Map         Disk    Thread         Time
-------------------------------------------------------------------------------
48000      782.8MB    5.8323GiB    11.665GiB    unlimited         1    unlimited

You can also set the thread limit from the command line:

Code: Select all

convert -limit thread 1 -list resource
File         Area       Memory          Map         Disk    Thread         Time
-------------------------------------------------------------------------------
48000      782.8MB    5.8323GiB    11.665GiB    unlimited         1    unlimited

We're using ImageMagick 6.6.7-6, the current release.

Legacy ImageMagick Discussions Archive

Slow system... where to begin..

Slow system... where to begin..

Re: Slow system... where to begin..

Re: Slow system... where to begin..

Re: Slow system... where to begin..

Re: Slow system... where to begin..