Re: Null-stripping performance

[Thelonius]

I'd recommend:

$value = unpack "x$index Z4", $string;

or

$value = substr($string, $index, 4);
$value =~ y/\0//d;

[Thelonius]

On my PC, The "substr(), y" method takes about 0.6 microseconds, the "substr(), s" method takes about 1 microsecond, the "unpack x$index" method takes about 2 microseconds.

The "unpack a$index" method takes about 41 microseconds (when averaged over a 262000 byte string), so it's the one to avoid. It has to allocate the large substring it skips over before it throws it away.

[qiau]

Thanks a lot. I really appreciate your help! I can mention, as a parenthesis, that this code is going to run in sparc solaris-environment. When I tried the script at my PC perl took care of the null's by itself and just the substr worked fine. I guess I have to live with the time it takes to do it "substr(),y"-way. Thanks again