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#!/usr/bin/perl
# Usage: pipe the output of Linux's `strace' program into the stdin of
# this command, and the output of this command into gnuplot.
my $filename = shift || "tstab2.h5";
my $total = 0;
my %What; # What{pos}{nbytes}{r|w} = naccesses
while (<>) {
if (!defined $fd) {
if (/^open\("(.*?)".*=\s+(\d+)/ && $1 eq $filename) {
$fd = $2;
$pos = 0;
}
} elsif (/^close\((\d+)/ && $1==$fd) {
$fd = undef;
} elsif (/^lseek\((\d+), -?\d+,.*= (\d+)/ &&
$1==$fd && $2>=0) {
$pos = $2;
} elsif (/^lseek\((\d+),/ && $1==$fd) {
die $_;
} elsif (/^write\((\d+), ".*?"(\.\.\.)?, \d+\)\s*= (\d+)/ &&
$1==$fd && $3>=0) {
my $nbytes = $3;
$What{$pos}{$nbytes}{w}++;
printf "%d %d\n", $total, $pos;
$pos += $nbytes;
$total += $nbytes;
} elsif (/^write\((\d+),/ && $1==$fd) {
die $_;
} elsif (/^read\((\d+), ".*?"(\.\.\.)?, \d+\)\s*= (\d+)/ &&
$1==$fd && $3>=0) {
my $nbytes = $3;
$What{$pos}{$nbytes}{r}++;
printf "%d %d\n", $total, $pos;
$pos += $nbytes;
$total += $nbytes;
} elsif (/^read\((\d+),/ && $1==$fd) {
die $_;
}
}
print "="x36, "\n";
printf "%8s %8s %8s %8s\n","Position","NBytes","NReads","NWrites";
for $pos (sort {$a<=>$b} keys %What) {
for $nbytes (sort {$a<=>$b} keys %{$What{$pos}}) {
printf "%8d %8d %8d %8d\n", $pos, $nbytes,
$What{$pos}{$nbytes}{r},
$What{$pos}{$nbytes}{w};
}
}
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