| 2019-05-30 08:29:45 |
Dariusz Gadomski |
description |
Under heavy workload conditions cups can reach irrationally high memory consumption very quickly (tens of GBs).
Test case:
1. Set MaxJobs to 40000 in cupsd.conf.
2. sudo apt install cups-pdf
3. Fill the queue with jobs:
while [ 1 ]; lp -d PDF /usr/share/cups/data/default.pdf; done
4. Cancel all jobs
cancel -a PDF
5. Restart cups.
6. Start filling the queue again (as in step 3).
Expected result:
Jobs are processed and memory consumption is proportional to the number of jobs.
Actual result:
After step 5 or at latest step 6 memory consumption starts to increase exponentially - from ~150-200 MB to 8+GB. Without foreseeing this it's very easy to get cups killed by OOM killer. |
Under heavy workload conditions cups can reach irrationally high memory consumption very quickly (tens of GBs).
Test case:
1. Set MaxJobs to 40000 in cupsd.conf.
2. sudo apt install cups-pdf
3. Fill the queue with jobs:
while [ 1 ]; lp -d PDF /usr/share/cups/data/default.pdf; done
4. Cancel all jobs
cancel -a PDF
5. Restart cups.
6. Start filling the queue again (as in step 3).
Expected result:
Jobs are processed and memory consumption is proportional to the number of jobs.
Actual result:
After step 5 or at latest step 6 memory consumption starts to increase exponentially - from ~150-200 MB to 8+GB. Without foreseeing this it's very easy to get cupsd killed by OOM killer. |
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