From: Greg Hazel <redmine@...>
Date: 2010-02-09T02:14:32+09:00
Subject: [ruby-core:28115] [Bug #2721] OpenSSL::Random.random_bytes(1) is very slow the first time on Windows

Issue #2721 has been updated by Greg Hazel.


A common stack:

ntdll.dll!RtlpNtMakeTemporaryKey+0x5866
ntdll.dll!RtlTimeToElapsedTimeFields+0x11922
ntdll.dll!RtlEnumProcessHeaps+0xac9
ntdll.dll!RtlEnumProcessHeaps+0xbc7
ntdll.dll!RtlValidateProcessHeaps+0x281
ntdll.dll!RtlTimeToElapsedTimeFields+0x12420
ntdll.dll!RtlQueryProcessHeapInformation+0x288
ntdll.dll!RtlTimeToElapsedTimeFields+0x6702
kernel32.dll!Heap32Next+0x4d
LIBEAY32.dll!RAND_poll+0x45f
msvcrt-ruby18.dll!rb_Array+0x2681
msvcrt-ruby18.dll!rb_funcall2+0x89


Another:

ntdll.dll!memset+0x45
ntdll.dll!RtlEnumProcessHeaps+0xbc7
ntdll.dll!RtlValidateProcessHeaps+0x281
ntdll.dll!RtlTimeToElapsedTimeFields+0x12420
ntdll.dll!RtlQueryProcessHeapInformation+0x288
ntdll.dll!RtlTimeToElapsedTimeFields+0x6702
kernel32.dll!Heap32Next+0x4d
LIBEAY32.dll!RAND_poll+0x45f
msvcrt-ruby18.dll!rb_Array+0x2681
msvcrt-ruby18.dll!rb_funcall2+0x89


Allocating the same amount of memory in a single string does not cause the same slow-down. So it looks like by defining classes many tiny malloc()s are done, which creates a large number of heap entries to walk.

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http://redmine.ruby-lang.org/issues/show/2721

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