#!/usr/bin/perl

# Parse the log output files of run-experiment
# Send concatenated log files to stdin, or list them on the command
# line.

use strict;

my $showmemusage = 0;
my $netsetup = '';
my %preproc_resources = ();
my @preproc_seconds = (0, 0, 0);
my @preproc_kib = (0, 0, 0);
my @preproc_latencies = (0, 0, 0);
my @preproc_mem_mib = (0, 0, 0);
my %preproc_s_data = ();
my %preproc_kib_data = ();
my %preproc_latencies_data = ();
my %preproc_P0mem_mib_data = ();
my %preproc_P1mem_mib_data = ();
my %preproc_P2mem_mib_data = ();
my %online_s_data = ();
my %online_kib_data = ();
my %online_latencies_data = ();
my %online_P0mem_mib_data = ();
my %online_P1mem_mib_data = ();
my %online_P2mem_mib_data = ();

if ($ARGV[0] eq "-m") {
    shift;
    $showmemusage = 1;
}

while(<>) {
    chomp;
    if (/Network setup: (.*)/) {
        $netsetup = "$1 ";
        next;
    }
    if (/===== Running prac (.*)/) {
        my $cmdline = $1;
        if ($cmdline =~ /-[pa]/) {
            &parse_preproc($cmdline);
            next;
        } elsif ($cmdline =~ /^-- read/) {
            &parse_read($cmdline);
        } elsif ($cmdline =~ /^-- b?bsearch/) {
            &parse_bsearch($cmdline);
        } elsif ($cmdline =~ /^-- heapsampler/) {
            &parse_heapsampler($cmdline);
        } elsif ($cmdline =~ /^-- heap/) {
            &parse_heap($cmdline);
        } elsif ($cmdline =~ /^-- avl/) {
            &parse_avl($cmdline);
        } else {
            warn "Unknown cmdline: $cmdline\n";
            while(<>) {
                last if /===== End/;
            }
        }
        %preproc_resources = ();
        @preproc_seconds = (0, 0, 0);
        @preproc_kib = (0, 0, 0);
        @preproc_latencies = (0, 0, 0);
        @preproc_mem_mib = (0, 0, 0);
        next;
    }
}

# Convert the data (in the form [n, sum, sum_squares]) to statistics (in
# the form [mean, variance])
my %preproc_s_stats = ();
my %preproc_kib_stats = ();
my %preproc_latencies_stats = ();
my %preproc_P0mem_mib_stats = ();
my %preproc_P1mem_mib_stats = ();
my %preproc_P2mem_mib_stats = ();
my %online_s_stats = ();
my %online_kib_stats = ();
my %online_latencies_stats = ();
my %online_P0mem_mib_stats = ();
my %online_P1mem_mib_stats = ();
my %online_P2mem_mib_stats = ();
&statsify(\%preproc_s_stats, \%preproc_s_data);
&statsify(\%preproc_kib_stats, \%preproc_kib_data);
&statsify(\%preproc_latencies_stats, \%preproc_latencies_data);
&statsify(\%preproc_P0mem_mib_stats, \%preproc_P0mem_mib_data);
&statsify(\%preproc_P1mem_mib_stats, \%preproc_P1mem_mib_data);
&statsify(\%preproc_P2mem_mib_stats, \%preproc_P2mem_mib_data);
&statsify(\%online_s_stats, \%online_s_data);
&statsify(\%online_kib_stats, \%online_kib_data);
&statsify(\%online_latencies_stats, \%online_latencies_data);
&statsify(\%online_P0mem_mib_stats, \%online_P0mem_mib_data);
&statsify(\%online_P1mem_mib_stats, \%online_P1mem_mib_data);
&statsify(\%online_P2mem_mib_stats, \%online_P2mem_mib_data);

# The total values are the sums of the preproc and online values
my %total_s_stats = ();
my %total_kib_stats = ();
&sum_preproc_online(\%total_s_stats, \%preproc_s_stats, \%online_s_stats);
&sum_preproc_online(\%total_kib_stats, \%preproc_kib_stats, \%online_kib_stats);

# Output the data
&output_stats(\%preproc_s_stats, "Preprc", "s");
&output_stats(\%preproc_kib_stats, "Preprc", "KiB");
&output_stats(\%preproc_latencies_stats, "Preprc", "latencies");
if ($showmemusage) {
    &output_stats(\%preproc_P0mem_mib_stats, "Preprc", "P0MemMiB");
    &output_stats(\%preproc_P1mem_mib_stats, "Preprc", "P1MemMiB");
    &output_stats(\%preproc_P2mem_mib_stats, "Preprc", "P2MemMiB");
}
&output_stats(\%online_s_stats, "Onln", "s");
&output_stats(\%online_kib_stats, "Onln", "KiB");
&output_stats(\%online_latencies_stats, "Onln", "latencies");
if ($showmemusage) {
    &output_stats(\%online_P0mem_mib_stats, "Onln", "P0MemMiB");
    &output_stats(\%online_P1mem_mib_stats, "Onln", "P1MemMiB");
    &output_stats(\%online_P2mem_mib_stats, "Onln", "P2MemMiB");
}
&output_stats(\%total_s_stats, "Totl", "s");
&output_stats(\%total_kib_stats, "Totl", "KiB");

# Subroutines

sub parse_preproc {
    my $cmdline = $_[0];
    my $who = 0;
    # Reset the preproc usages unless we're appending to a previous
    # preproc
    unless ($cmdline =~ /-a/) {
        %preproc_resources = ();
        @preproc_seconds = (0, 0, 0);
        @preproc_kib = (0, 0, 0);
        @preproc_latencies = (0, 0, 0);
        @preproc_mem_mib = (0, 0, 0);
    }
    &parse_resources(\%preproc_resources, $cmdline);
    while(<>) {
        if (/===== P([012]) output/) {
            $who = $1;
            next;
        }
        last if /===== End/;
        # Try to recover from a malformed log
        last if /^Max MB:/;
        # It was too malformed
        die "Malformed log" if /===== Running/;
        if (/^(\d+) message bytes sent/) {
            $preproc_kib[$who] += $1 / 1024;
        } elsif (/^(\d+) Lamport clock/) {
            $preproc_latencies[$who] += $1;
        } elsif (/^(\d+) milliseconds? wall clock/) {
            $preproc_seconds[$who] += $1 / 1000;
        } elsif (/^Mem: (\d+) KiB/) {
            $preproc_mem_mib[$who] += $1 / 1024;
        }
    }
}

# Parse a resource usage string, and accumulate the values into the
# given dict
sub parse_resources {
    my ($dict, $resstr) = @_;
    while ($resstr =~ /(\S+):(\d+)/g) {
        $dict->{$1} = 0 unless defined $dict->{$1};
        $dict->{$1} += $2;
    }
}

# Serialize a resource usage dict back into a canonical string
sub serialize_resources {
    my $dict = $_[0];
    my $res = '';
    my $k;
    foreach $k (sort keys %$dict) {
        if ($res ne '') {
            $res .= ' ';
        }
        $res .= $k . ":" . $dict->{$k};
    }
    $res;
}

sub parse_read {
    my $cmdline = $_[0];
    my $who = 0;
    my @online_seconds = (0, 0, 0);
    my @online_kib = (0, 0, 0);
    my @online_latencies = (0, 0, 0);
    my @online_mem_mib = (0, 0, 0);

    unless ($cmdline =~ /read (\d+) (\d+)/) {
        die "Cannot parse read cmdline: $cmdline";
    }
    my ($size, $num) = ($1, $2);
    while(<>) {
        if (/===== P([012]) output/) {
            $who = $1;
            next;
        }
        last if /===== End/;
        # Try to recover from a malformed log
        last if /^Max MB:/;
        # It was too malformed
        die "Malformed log" if /===== Running/;
        if (/^(\d+) message bytes sent/) {
            $online_kib[$who] = $1 / 1024;
        } elsif (/^(\d+) Lamport clock/) {
            $online_latencies[$who] = $1;
        } elsif (/^(\d+) milliseconds? wall clock/) {
            $online_seconds[$who] = $1 / 1000;
        } elsif (/^Mem: (\d+) KiB/) {
            $online_mem_mib[$who] = $1 / 1024;
        } elsif ($who == 0 && /^Precomputed values used: (.*)/) {
            my %used_resources = ();
            &parse_resources(\%used_resources, $1);
            my $preproc_resources_str = &serialize_resources(\%preproc_resources);
            my $used_resources_str = &serialize_resources(\%used_resources);
            if ($preproc_resources_str ne $used_resources_str) {
                warn "Resource usage does not match preprocessing:\n" .
                    "Preproc: $preproc_resources_str\n" .
                    "Used: $used_resources_str\n ";
            }
        }
    }
    my $label = "PRAC read $netsetup$size $num";
    &accum_data(\%preproc_s_data, $label, &maxarray(@preproc_seconds));
    &accum_data(\%preproc_kib_data, $label, &avgarray(@preproc_kib));
    &accum_data(\%preproc_latencies_data, $label, &maxarray(@preproc_latencies));
    &accum_data(\%preproc_P0mem_mib_data, $label, $preproc_mem_mib[0]);
    &accum_data(\%preproc_P1mem_mib_data, $label, $preproc_mem_mib[1]);
    &accum_data(\%preproc_P2mem_mib_data, $label, $preproc_mem_mib[2]);
    &accum_data(\%online_s_data, $label, &maxarray(@online_seconds));
    &accum_data(\%online_kib_data, $label, &avgarray(@online_kib));
    &accum_data(\%online_latencies_data, $label, &maxarray(@online_latencies));
    &accum_data(\%online_P0mem_mib_data, $label, $online_mem_mib[0]);
    &accum_data(\%online_P1mem_mib_data, $label, $online_mem_mib[1]);
    &accum_data(\%online_P2mem_mib_data, $label, $online_mem_mib[2]);
}

sub parse_bsearch {
    my $cmdline = $_[0];
    my $optimized = "Opt";
    if ($cmdline =~ /bbsearch/) {
        $optimized = "Basic";
    }
    my $who = 0;
    my $section = '';
    my @online_seconds = (0, 0, 0);
    my @online_kib = (0, 0, 0);
    my @online_latencies = (0, 0, 0);
    my @online_mem_mib = (0, 0, 0);

    unless ($cmdline =~ /b?bsearch (\d+) (\d+)/) {
        die "Cannot parse bsearch cmdline: $cmdline";
    }
    my ($size, $num) = ($1, $2);
    while(<>) {
        if (/===== P([012]) output/) {
            $who = $1;
            next;
        }
        if (/===== ([A-Z ]+) =====/) {
            $section = $1;
            next;
        }
        last if /===== End/;
        # Try to recover from a malformed log
        last if /^Max MB:/;
        # It was too malformed
        die "Malformed log" if /===== Running/;
        if ($section eq "BINARY SEARCH") {
            if (/^(\d+) message bytes sent/) {
                $online_kib[$who] = $1 / 1024;
            } elsif (/^(\d+) Lamport clock/) {
                $online_latencies[$who] = $1;
            } elsif (/^(\d+) milliseconds? wall clock/) {
                $online_seconds[$who] = $1 / 1000;
            } elsif (/^Mem: (\d+) KiB/) {
                $online_mem_mib[$who] = $1 / 1024;
            }
        }
        if ($who == 0 && /^Precomputed values used: (.*)/) {
            my %used_resources = ();
            &parse_resources(\%used_resources, $1);
            my $preproc_resources_str = &serialize_resources(\%preproc_resources);
            my $used_resources_str = &serialize_resources(\%used_resources);
            if ($preproc_resources_str ne $used_resources_str) {
                warn "Resource usage does not match preprocessing:\n" .
                    "Preproc: $preproc_resources_str\n" .
                    "Used: $used_resources_str\n ";
            }
        }
    }
    my $label = "${optimized}PRAC bsearch $netsetup$size $num";
    &accum_data(\%preproc_s_data, $label, &maxarray(@preproc_seconds));
    &accum_data(\%preproc_kib_data, $label, &avgarray(@preproc_kib));
    &accum_data(\%preproc_latencies_data, $label, &maxarray(@preproc_latencies));
    &accum_data(\%preproc_P0mem_mib_data, $label, $preproc_mem_mib[0]);
    &accum_data(\%preproc_P1mem_mib_data, $label, $preproc_mem_mib[1]);
    &accum_data(\%preproc_P2mem_mib_data, $label, $preproc_mem_mib[2]);
    &accum_data(\%online_s_data, $label, &maxarray(@online_seconds));
    &accum_data(\%online_kib_data, $label, &avgarray(@online_kib));
    &accum_data(\%online_latencies_data, $label, &maxarray(@online_latencies));
    &accum_data(\%online_P0mem_mib_data, $label, $online_mem_mib[0]);
    &accum_data(\%online_P1mem_mib_data, $label, $online_mem_mib[1]);
    &accum_data(\%online_P2mem_mib_data, $label, $online_mem_mib[2]);
}

sub parse_heap {
    my $cmdline = $_[0];
    my $who = 0;
    my $section = '';
    my @online_seconds = (0, 0, 0);
    my @online_kib = (0, 0, 0);
    my @online_latencies = (0, 0, 0);
    my @online_mem_mib = (0, 0, 0);

    my $optimized = "Opt";
    my $oper = "";
    unless ($cmdline =~ /heap -m (\d+) -d \d+ -i (\d+) -e (\d+) -opt (\d+) -s 0/) {
        die "Cannot parse heap cmdline: $cmdline";
    }
    my ($size, $nins, $next, $optflag) = ($1, $2, $3, $4);
    if ($nins > 0 && $next > 0) {
        die "heap does both insertions and extractions: $cmdline\n";
    }
    $oper = "Ins" if $nins > 0;
    $oper = "Ext" if $next > 0;
    if ($optflag == 0) {
        $optimized = "Basic";
    }
    my $num = ($nins + $next);
    while(<>) {
        if (/===== P([012]) output/) {
            $who = $1;
            next;
        }
        if (/===== ([A-Za-z ]+) Stats =====/) {
            $section = $1;
            next;
        }
        last if /===== End/;
        # Try to recover from a malformed log
        last if /^Max MB:/;
        # It was too malformed
        die "Malformed log" if /===== Running/;
        my $rightsection = 0;
        if ($section eq "Insert" && $oper eq "Ins") {
            $rightsection = 1;
        }
        if ($section eq "Extract Min" && $oper eq "Ext") {
            $rightsection = 1;
        }
        if ($rightsection) {
            if (/^(\d+) message bytes sent/) {
                $online_kib[$who] = $1 / 1024;
            } elsif (/^(\d+) Lamport clock/) {
                $online_latencies[$who] = $1;
            } elsif (/^(\d+) milliseconds? wall clock/) {
                $online_seconds[$who] = $1 / 1000;
            } elsif (/^Mem: (\d+) KiB/) {
                $online_mem_mib[$who] = $1 / 1024;
            }
        }
        if ($who == 0 && /^Precomputed values used: (.*)/) {
            my %used_resources = ();
            &parse_resources(\%used_resources, $1);
            my $preproc_resources_str = &serialize_resources(\%preproc_resources);
            my $used_resources_str = &serialize_resources(\%used_resources);
            if ($preproc_resources_str ne $used_resources_str) {
                warn "Resource usage does not match preprocessing:\n" .
                    "Preproc: $preproc_resources_str\n" .
                    "Used: $used_resources_str\n ";
            }
        }
    }
    my $label = "${optimized}PRAC heap$oper $netsetup$size $num";
    &accum_data(\%preproc_s_data, $label, &maxarray(@preproc_seconds));
    &accum_data(\%preproc_kib_data, $label, &avgarray(@preproc_kib));
    &accum_data(\%preproc_latencies_data, $label, &maxarray(@preproc_latencies));
    &accum_data(\%preproc_P0mem_mib_data, $label, $preproc_mem_mib[0]);
    &accum_data(\%preproc_P1mem_mib_data, $label, $preproc_mem_mib[1]);
    &accum_data(\%preproc_P2mem_mib_data, $label, $preproc_mem_mib[2]);
    &accum_data(\%online_s_data, $label, &maxarray(@online_seconds));
    &accum_data(\%online_kib_data, $label, &avgarray(@online_kib));
    &accum_data(\%online_latencies_data, $label, &maxarray(@online_latencies));
    &accum_data(\%online_P0mem_mib_data, $label, $online_mem_mib[0]);
    &accum_data(\%online_P1mem_mib_data, $label, $online_mem_mib[1]);
    &accum_data(\%online_P2mem_mib_data, $label, $online_mem_mib[2]);
}

sub parse_avl {
    my $cmdline = $_[0];
    my $who = 0;
    my $section = '';
    my @online_seconds = (0, 0, 0);
    my @online_kib = (0, 0, 0);
    my @online_latencies = (0, 0, 0);
    my @online_mem_mib = (0, 0, 0);

    my $optimized = "Opt";
    my $oper = "";
    unless ($cmdline =~ /avl -m (\d+) -i (\d+) -e (\d+) -opt (\d+) -s 0/) {
        die "Cannot parse heap cmdline: $cmdline";
    }
    my ($size, $nins, $ndel, $optflag) = ($1, $2, $3, $4);
    if ($nins > 0 && $ndel > 0) {
        die "avl does both insertions and deletions: $cmdline\n";
    }
    $oper = "Ins" if $nins > 0;
    $oper = "Del" if $ndel > 0;
    if ($optflag == 0) {
        $optimized = "Basic";
    }
    my $num = ($nins + $ndel);

    while(<>) {
        if (/===== P([012]) output/) {
            $who = $1;
            next;
        }
        if (/===== ([A-Z ]+) =====/) {
            $section = $1;
            next;
        }
        last if /===== End/;
        # Try to recover from a malformed log
        last if /^Max MB:/;
        # It was too malformed
        die "Malformed log" if /===== Running/;
        my $rightsection = 0;
        if ($section eq "INSERTS" && $oper eq "Ins") {
            $rightsection = 1;
        }
        if ($section eq "DELETES" && $oper eq "Del") {
            $rightsection = 1;
        }
        if ($rightsection) {
            if (/^(\d+) message bytes sent/) {
                $online_kib[$who] = $1 / 1024;
            } elsif (/^(\d+) Lamport clock/) {
                $online_latencies[$who] = $1;
            } elsif (/^(\d+) milliseconds? wall clock/) {
                $online_seconds[$who] = $1 / 1000;
            } elsif (/^Mem: (\d+) KiB/) {
                $online_mem_mib[$who] = $1 / 1024;
            }
        }
        if ($who == 0 && /^Precomputed values used: (.*)/) {
            my %used_resources = ();
            &parse_resources(\%used_resources, $1);
            my $preproc_resources_str = &serialize_resources(\%preproc_resources);
            my $used_resources_str = &serialize_resources(\%used_resources);
            if ($preproc_resources_str ne $used_resources_str) {
                warn "Resource usage does not match preprocessing:\n" .
                    "Preproc: $preproc_resources_str\n" .
                    "Used: $used_resources_str\n ";
            }
        }
    }
    my $label = "${optimized}PRAC avl$oper $netsetup$size $num";
    &accum_data(\%preproc_s_data, $label, &maxarray(@preproc_seconds));
    &accum_data(\%preproc_kib_data, $label, &avgarray(@preproc_kib));
    &accum_data(\%preproc_latencies_data, $label, &maxarray(@preproc_latencies));
    &accum_data(\%preproc_P0mem_mib_data, $label, $preproc_mem_mib[0]);
    &accum_data(\%preproc_P1mem_mib_data, $label, $preproc_mem_mib[1]);
    &accum_data(\%preproc_P2mem_mib_data, $label, $preproc_mem_mib[2]);
    &accum_data(\%online_s_data, $label, &maxarray(@online_seconds));
    &accum_data(\%online_kib_data, $label, &avgarray(@online_kib));
    &accum_data(\%online_latencies_data, $label, &maxarray(@online_latencies));
    &accum_data(\%online_P0mem_mib_data, $label, $online_mem_mib[0]);
    &accum_data(\%online_P1mem_mib_data, $label, $online_mem_mib[1]);
    &accum_data(\%online_P2mem_mib_data, $label, $online_mem_mib[2]);
}

sub parse_heapsampler {
    my $cmdline = $_[0];
    my $who = 0;
    my $section = '';
    my @online_seconds = (0, 0, 0);
    my @online_kib = (0, 0, 0);
    my @online_latencies = (0, 0, 0);
    my @online_mem_mib = (0, 0, 0);

    unless ($cmdline =~ /heapsampler (\d+) (\d+)/) {
        die "Cannot parse heapsampler cmdline: $cmdline";
    }
    my ($num, $size) = ($1, $2);
    while(<>) {
        if (/===== P([012]) output/) {
            $who = $1;
            next;
        }
        if (/===== ([A-Z ]+) =====/) {
            $section = $1;
            next;
        }
        last if /===== End/;
        # Try to recover from a malformed log
        last if /^Max MB:/;
        # It was too malformed
        die "Malformed log" if /===== Running/;
        if ($section eq "STREAMING") {
            if (/^(\d+) message bytes sent/) {
                $online_kib[$who] = $1 / 1024;
            } elsif (/^(\d+) Lamport clock/) {
                $online_latencies[$who] = $1;
            } elsif (/^(\d+) milliseconds? wall clock/) {
                $online_seconds[$who] = $1 / 1000;
            } elsif (/^Mem: (\d+) KiB/) {
                $online_mem_mib[$who] = $1 / 1024;
            }
        }
        if ($who == 0 && /^Precomputed values used: (.*)/) {
            my %used_resources = ();
            &parse_resources(\%used_resources, $1);
            my $preproc_resources_str = &serialize_resources(\%preproc_resources);
            my $used_resources_str = &serialize_resources(\%used_resources);
            if ($preproc_resources_str ne $used_resources_str) {
                warn "Resource usage does not match preprocessing:\n" .
                    "Preproc: $preproc_resources_str\n" .
                    "Used: $used_resources_str\n ";
            }
        }
    }
    my $label = "PRAC heapsampler $netsetup$size $num";
    &accum_data(\%preproc_s_data, $label, &maxarray(@preproc_seconds));
    &accum_data(\%preproc_kib_data, $label, &avgarray(@preproc_kib));
    &accum_data(\%preproc_latencies_data, $label, &maxarray(@preproc_latencies));
    &accum_data(\%preproc_P0mem_mib_data, $label, $preproc_mem_mib[0]);
    &accum_data(\%preproc_P1mem_mib_data, $label, $preproc_mem_mib[1]);
    &accum_data(\%preproc_P2mem_mib_data, $label, $preproc_mem_mib[2]);
    &accum_data(\%online_s_data, $label, &maxarray(@online_seconds));
    &accum_data(\%online_kib_data, $label, &avgarray(@online_kib));
    &accum_data(\%online_latencies_data, $label, &maxarray(@online_latencies));
    &accum_data(\%online_P0mem_mib_data, $label, $online_mem_mib[0]);
    &accum_data(\%online_P1mem_mib_data, $label, $online_mem_mib[1]);
    &accum_data(\%online_P2mem_mib_data, $label, $online_mem_mib[2]);
}

sub maxarray {
    my $max = $_[0];
    foreach (@_) {
        $max = $_ if $_ > $max;
    }
    $max;
}

sub avgarray {
    my $sum = 0;
    my $n = 0;
    foreach (@_) {
        $sum += $_;
        $n += 1;
    }
    $sum / $n;
}

# Pass:
# - a reference to a dictionary
# - the key into that dictionary
# - the new data point
# Data is stored in the dictionary as a triple (n, sum, sum_squares)
sub accum_data {
    my ($dict, $key, $data) = @_;
    $dict->{$key} = [0, 0, 0] unless defined $dict->{$key};
    $dict->{$key}->[0] += 1;
    $dict->{$key}->[1] += $data;
    $dict->{$key}->[2] += ($data * $data);
}

# Convert data (in the form [n, sum, sum_squares]) to statistics (in
# the form [mean, variance])
sub statsify {
    my ($sdict, $ddict) = @_;
    my $key;
    foreach $key (keys %$ddict) {
        my $data = $ddict->{$key};
        my $n = $data->[0];
        my $sum = $data->[1];
        my $sumsq = $data->[2];
        if ($n == 0) {
            $sdict->{$key} = [undef, undef];
        } elsif ($n == 1) {
            $sdict->{$key} = [$sum, undef];
        } else {
            $sdict->{$key} = [$sum/$n, ($sumsq - ($sum*$sum/$n))/($n-1)];
        }
    }
}

# Turn a stat array [mean, variance] into a string to display
sub statstr {
    my $data = $_[0];
    if (defined $data->[1]) {
        my $mean = $data->[0];
        my $stddev = $data->[1] > 0 ? sqrt($data->[1]) : 0;
        return "$mean ± $stddev";
    } elsif (defined $data->[0]) {
        return $data->[0];
    } else {
        return "none"
    }
}

# Sum two stat arrays
sub statsum {
    my ($data0, $data1) = @_;
    if (defined $data0->[1] && defined $data1->[1]) {
        return [$data0->[0] + $data1->[0], $data0->[1] + $data1->[1]];
    } else {
        return [$data0->[0] + $data1->[0], undef];
    }
}

# Add the preproc and online stats to get the total stats
sub sum_preproc_online {
    my ($tdict, $pdict, $odict) = @_;
    my $key;
    foreach $key (keys %$pdict) {
        if (defined $odict->{$key}) {
            $tdict->{$key} = &statsum($pdict->{$key}, $odict->{$key});
        }
    }
}

# Output the stats in the given dictionary. Append $phase to the
# protocol name, and add $units to the end.
sub output_stats {
    my ($dict, $phase, $units) = @_;
    my $label;
    foreach $label (sort keys %$dict) {
        my $printlabel = $label;
        $printlabel =~ s/PRAC/PRAC$phase/;
        print $printlabel, " ", &statstr($dict->{$label}), " $units\n";
    }
}