[Bug 1840847] Re: cpuinfo_linux_get_max_processors_count always warns Ubuntu default MAX cpu values (stderr)

Mathew Hodson mathew.hodson at gmail.com
Sun Sep 8 05:57:53 UTC 2019


** No longer affects: linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1840847

Title:
  cpuinfo_linux_get_max_processors_count always warns Ubuntu default MAX
  cpu values (stderr)

Status in cpuinfo package in Ubuntu:
  Fix Released

Bug description:
  From bug:

  https://bugs.launchpad.net/bugs/1840511

  clickhouse builds test started failing because of the presence of
  stderr whenever using the function:

  cpuinfo_linux_get_max_processors_count(void)

  From cpuid library.

  This happens because:

  ----

  #if defined(__ANDROID__) && !defined(CPU_SETSIZE)
      /*
       * Android NDK headers before platform 21 do not define CPU_SETSIZE,
       * so we hard-code its value, as defined in platform 21 headers
       */
      #if defined(__LP64__)
          static const uint32_t default_max_processors_count = 1024;
      #else
          static const uint32_t default_max_processors_count = 32;
      #endif
  #else
      static const uint32_t default_max_processors_count = CPU_SETSIZE;
  #endif

  ----

  #if !defined(__ANDROID__)
      /*
       * sched.h is only used for CPU_SETSIZE constant.
       * Android NDK headers before platform 21 do have this constant in sched.h
       */
      #include <sched.h>
  #endif

  ----

  and resolving includes:

  x86_64-linux-gnu/bits/cpu-set.h:

  /* Size definition for CPU sets. */
  #define __CPU_SETSIZE 1024

  ----

  And the warning:

  Warning in cpuinfo: kernel_max value of 8191 parsed from
  /sys/devices/system/cpu/kernel_max exceeds platform-default limit 1023

  Will always be displayed in Ubuntu OS, when it should NOT (does not
  make any sense to trigger a warning for something that can't be
  changed).

  FOR THE KERNEL TEAM:

  Should ubuntu update sched.h and/or cpu-set.h to reflect its decision
  in using 8192 max CPUs ?

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