Re: Re: pipes and return data

Please, if you are going to post a benchmark and results, do so responsibly. The code you posted has (at least) two errors:

timethese( 100], {

Where'd that spurious ']' come from? I realize this was probably a cut-n-paste error, but still...

open PROG, ">/dev/nul";

This one is more serious. It implies that you tested printing your strings to a non-existent file handle. Ooops.

Benchmark: timing 100 iterations of join, local, manual...

Wait... what about 'html'? So, I guess you ran that later and added it into your results?

I probably would have missed all of this had I not been suspicious of your results. I would have guessed the 'html' version to be the fastest by far... so I had to check for myself. Here are the results I got, after correcting the errors noted above:

Benchmark: timing 100 iterations of html, join, local, manual...
      html: 46 wallclock secs (45.58 usr +  0.05 sys = 45.63 CPU) @  2
+.19/s (n=100)
      join: 220 wallclock secs (219.65 usr +  0.07 sys = 219.72 CPU) @
+  0.46/s (n=100)
     local: 221 wallclock secs (220.61 usr +  0.14 sys = 220.75 CPU) @
+  0.45/s (n=100)
    manual: 866 wallclock secs (864.92 usr +  0.26 sys = 865.18 CPU) @
+  0.12/s (n=100)
[download]

For completeness:

$ prtdiag | head -3
System Configuration:  Sun Microsystems  sun4u 4-slot Sun Enterprise 3
+000
System clock frequency: 84 MHz
Memory size: 1024Mb
[download]

To double check those findings, I ran it on a PC as well:

Benchmark: timing 100 iterations of html, join, local, manual...
      html:  7 wallclock secs ( 6.36 usr +  0.01 sys =  6.37 CPU) @ 15
+.70/s (n=100)
      join: 22 wallclock secs (22.27 usr +  0.01 sys = 22.28 CPU) @  4
+.49/s (n=100)
     local: 22 wallclock secs (22.46 usr +  0.02 sys = 22.48 CPU) @  4
+.45/s (n=100)
    manual: 76 wallclock secs (75.38 usr +  0.01 sys = 75.39 CPU) @  1
+.33/s (n=100)
[download]

And, again, for completeness here is some system info:

Linux 2.4.18-14
model name      : Intel(R) Pentium(R) 4 CPU 2.40GHz
stepping        : 4
cpu MHz         : 2405.502
cache size      : 512 KB
MemTotal:       513908 kB
MemFree:        388036 kB
[download]

Frankly, I still don't know how you managed to get such poor figures for the 'html' code.

-sauoq
"My two cents aren't worth a dime.";

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