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go_faq: add question: Why does Go perform badly on benchmark X?

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https://golang.org/cl/895043
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Andrew Gerrand 2010-04-21 14:00:56 +10:00
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@ -162,7 +162,7 @@ Can I translate the Go home page into another language?</h3>
<p>
Absolutely. We encourage developers to make Go Language sites in their own languages.
However, if choose to add the Google logo or branding to your site
However, if you choose to add the Google logo or branding to your site
(it does not appear on <a href="http://golang.org/">golang.org</a>),
you will need to abide by the guidelines at
<a href="http://www.google.com/permissions/guidelines.html">http://www.google.com/permissions/guidelines.html</a>
@ -334,3 +334,37 @@ compiled with a version of the Plan 9 C compiler that supports
segmented stacks for goroutines.
Work is underway to provide the same stack management in
<code>gccgo</code>.
<h2 id="Performance">Performance</h2>
<h3 id="Why_does_Go_perform_badly_on_benchmark_x">
Why does Go perform badly on benchmark X?</h3>
<p>
One of Go's design goals is to approach the performance of C for comparable
programs, yet on some benchmarks it does quite poorly, including several
in <a href="/test/bench/">test/bench</a>. The slowest depend on libraries
for which versions of comparable performance are not available in Go.
For instance, pidigits depends on a multi-precision math package, and the C
versions, unlike Go's, use <a href="http://gmplib.org/">GMP</a> (which is
written in optimized assembler).
Benchmarks that depend on regular expressions (regex-dna, for instance) are
essentially comparing Go's stopgap <a href="/pkg/regexp">regexp package</a> to
mature, highly optimized regular expression libraries like PCRE.
</p>
<p>
Benchmark games are won by extensive tuning and the Go versions of most
of the benchmarks need attention. If you measure comparable C
and Go programs (reverse-complement is one example), you'll see the two
languages are much closer in raw performance than this suite would
indicate.
</p>
<p>
Still, there is room for improvement. The compilers are good but could be
better, many librarise need major performance work, and the garbage collector
isn't fast enough yet (even if it were, taking care not to generate unnecessary
garbage can have a huge effect).
</p>