05-24-2012
What's your system? What's your shell?
If you're on Linux I'd be tempted to use ( grep -m 1 "myregex" ; cat ) < inputfile > outputfile, using GNU grep just to get to the right place in the file and cat-ing the rest, which should be about as fast as anything can get.
If that's not fast enough, the bottleneck may not be your program.
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Xmark(1) General Commands Manual Xmark(1)
NAME
Xmark - summarize x11perf results
SYNTAX
Xmark datafile
DESCRIPTION
Xmark is a shell script that reads the indicated datafile and compiles a benchmark which it writes to standard output. It writes three
numbers:
A weighted performance number for the x11perf results.
A weighted performance number for a standard SparcStation 1, with SunOS 4.1.2, X11R5 Xsun, and a CG3 dumb Color Frame Buffer.
The Xmark, which is the ratio of the two numbers above.
The datafile must be an ordinary file, produced by x11perf in the following way:
x11perf -display display -v1.3 -rop GXcopy GXxor -all > datafile
It is possible to run the GXcopy and GXxor tests separately, as long as they are concatenated to the same output file:
x11perf -display display -v1.3 -rop GXcopy -all > datafile
x11perf -display display -v1.3 -rop GXxor -all >> datafile
or
x11perf -display display -v1.3 -rop GXxor -all > datafile
x11perf -display display -v1.3 -rop GXcopy -all >> datafile
FILES
temp.$$
Temporary file created in the current directory, deleted after use.
DIAGNOSTICS
Usage: Xmark datafile
Xmark was invoked without arguments or with more than one argument, or with options. Xmark takes no options.
Error: data file does not exist or is not ordinary.
Xmark cannot find the datafile named on its command line, or the datafile is a special file such as a directory.
WARNING: datafile contains nnn, not 441 or 447 'trep' results;
The file named on the command line does not seem to be a file generated by x11perf in the expected way.
Diagnostic: ERROR: sum of weights =nnn, not equal to 4566.0;
There is an internal error in Xmark.
SEE ALSO
X(7x), x11perf(1), x11perfcomp(1)
X Version 11 Release 6.6 Xmark(1)