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Linux high load with ImageMagick convert utility and server freezes (blktrack output attached)

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http://serverfault.com – I'm using ImageMagick to convert a JPG to TIF file, and I'm using the limit options for Imagemagick as below: /usr/bin/convert -limit memory 256 -limit map 512 subjectfile.jpg -colorspace Gray -depth 8 -resample 200x200 output.tif When I run the above command the load on the server suddenly goes very high and the CPUs get in wait state for most of the time as below: Tasks: 245 total, 3 running, 241 sleeping, 0 stopped, 1 zombie Cpu0 : 0.0%us, 0.0%sy, 0.0%ni, 0.0%id,100.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu1 :100.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st (HowTos)