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| author | Christian Franke <christian.franke@t-online.de> | 2025-03-29 16:34:33 +0100 |
|---|---|---|
| committer | Christian Franke <christian.franke@t-online.de> | 2025-03-31 09:55:12 +0200 |
| commit | ac28fce85cc4d8f85c2cf10bb52d39f33ec38ed6 (patch) | |
| tree | 40e7ff4ab2ba5b9a8dd007bfb064fd41b7cb6900 | |
| parent | 98112b9f6f90dbce1ded637dd533ff0f5a1dffa9 (diff) | |
| download | newlib-ac28fce85cc4d8f85c2cf10bb52d39f33ec38ed6.zip newlib-ac28fce85cc4d8f85c2cf10bb52d39f33ec38ed6.tar.gz newlib-ac28fce85cc4d8f85c2cf10bb52d39f33ec38ed6.tar.bz2 | |
Cygwin: faq: add test of fork/exec slowdown by anti-virus
Signed-off-by: Christian Franke <christian.franke@t-online.de>
| -rw-r--r-- | winsup/doc/faq-using.xml | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/winsup/doc/faq-using.xml b/winsup/doc/faq-using.xml index 4dc462a..e5e4479 100644 --- a/winsup/doc/faq-using.xml +++ b/winsup/doc/faq-using.xml @@ -956,6 +956,26 @@ contents are exempt from scanning. In a default installation, this would be <literal>C:\cygwin\bin</literal>. Obviously, this could be exploited by a hostile non-Cygwin program, so do this at your own risk. </para> +<para>Anti-virus software typically reduce the speed of Windows +<literal>CreateProcess</literal> calls which are used by Cygwin to provide +<literal>fork()</literal> and <literal>exec()</literal>. This in particular +slows down shell scripts. In the simple speed test shown below, the first +column shows the number of <literal>date</literal> commands run per second. +Anti-virus was turned off at the line marked with <literal>***</literal>. +</para> +<screen> + bash$ while :; do date +%s; done | uniq -c + ... + 122 1741712430 + 118 1741712431 + 118 1741712432 + 121 1741712433 + 142 1741712434 *** + 140 1741712435 + 141 1741712436 + 144 1741712437 + ... +</screen> <para>See also <xref linkend="faq.using.bloda"></xref> for a list of applications that have been known, at one time or another, to interfere with the normal functioning of Cygwin. |