Add unique_set_size for servers and workers #139
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Why? USS is a more reliable mechanism for tracking workers with runaway memory growth. PSS is great, until the server process that forks new processes grows large. As each new worker is forked, it inherits a share of the large amount of the parent process' memory and therefore starts with a large PSS, possibly exceeding our limits before doing any work. USS only measures a process' private memory and is a better indicator when a process is responsible for allocating too much memory without freeing it.
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@miq-bot add_label gaprindashvili/yes |
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@miq-bot add_label enhancement |
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@gtanzillo @Fryguy please review |
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Checked commit jrafanie@dfac144 with ruby 2.3.3, rubocop 0.47.1, haml-lint 0.20.0, and yamllint 1.10.0 |
gtanzillo
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Nov 30, 2017
simaishi
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Dec 1, 2017
Add unique_set_size for servers and workers (cherry picked from commit 7e36f4e)
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Gaprindashvili backport details: |
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Why? USS is a more reliable mechanism for tracking workers with runaway
memory growth. PSS is great, until the server process that forks new
processes grows large. As each new worker is forked, it inherits a share
of the large amount of the parent process' memory and therefore starts
with a large PSS, possibly exceeding our limits before doing any work.
USS only measures a process' private memory and is a better indicator
when a process is responsible for allocating too much memory without
freeing it.
This is needed for PR: ManageIQ/manageiq#16569