Martin Boßlet created JRUBY-6437:
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Summary: IOInputStream Performance Regression
Key: JRUBY-6437
URL: https://jira.codehaus.org/browse/JRUBY-6437
Project: JRuby
Issue Type: Bug
Components: Core Classes/Modules
Affects Versions: JRuby 1.6.5, JRuby 1.7
Reporter: Martin Boßlet
Attachments: certificate.cer
The following code
@JRubyMethod(meta = true)
public static IRubyObject test(ThreadContext ctx, IRubyObject recv, IRubyObject
value) {
try {
Ruby rt = ctx.getRuntime();
InputStream in = new IOInputStream(value);
byte[] buf = new byte[8192];
int read;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
while ((read = in.read(buf)) != -1) {
baos.write(buf, 0, read);
}
return rt.newString(new ByteList(baos.toByteArray(), false));
} catch(Exception e) {
throw ctx.getRuntime().newRuntimeError(e.getMessage());
}
}
runs noticeably slower in JRuby trunk than on JRuby 1.6.5.1. Here's my
benchmarks:
$ jruby -v
jruby 1.7.0.dev (ruby-1.8.7-p357) (2012-01-21 0d0c764) (Java HotSpot(TM) 64-Bit
Server VM 1.7.0_02) [linux-amd64-java]
$ jruby --1.9 -Ilib test/scratch.rb
user system total real
File.new 8.331000 0.000000 8.331000 ( 8.331000)
File.open 6.291000 0.000000 6.291000 ( 6.291000)
File.open(..., 'rb') 6.502000 0.000000 6.502000 ( 6.502000)
$ jruby -v
jruby 1.6.5.1 (ruby-1.8.7-p330) (2011-12-27 1bf37c2) (Java HotSpot(TM) 64-Bit
Server VM 1.7.0_02) [linux-amd64-java]
$ jruby --1.9 -Ilib test/scratch.rb
user system total real
File.new 6.802000 0.000000 6.802000 ( 6.801000)
File.open 5.253000 0.000000 5.253000 ( 5.253000)
File.open(..., 'rb') 5.145000 0.000000 5.145000 ( 5.146000)
where the IO object was created using
File.new(File.expand_path("certificate.cer", File.dirname(__FILE__)))
File.open(File.expand_path("certificate.cer", File.dirname(__FILE__)))
File.open(File.expand_path("certificate.cer", File.dirname(__FILE__)), "rb")
for the corresponding lines.
I also attached the "certificate.cer". Due to the small size of the file,
IOInputStream#read is essentially only called twice in the while
loop.
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