Skip to content

Sharryy #284

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
sharryy wants to merge 2 commits into
base: main
Choose a base branch
from
Open

Sharryy #284

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
452d751
Optimised multi-core parser
sharryy Mar 15, 2026
01c84cb
Loop unrolling x8 + tighter date range detection
sharryy Mar 15, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
283 changes: 279 additions & 4 deletions app/Parser.php
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2,12 +2,287 @@

namespace App;

use Exception;

final class Parser
{
public function parse(string $inputPath, string $outputPath): void
{
throw new Exception('TODO');
gc_disable();

$fileSize = filesize($inputPath);

// Detect year range from first 200 lines for accuracy
$fp = fopen($inputPath, 'r');
$minYear = PHP_INT_MAX;
$maxYear = PHP_INT_MIN;
for ($i = 0; $i < 200; $i++) {
$line = fgets($fp);
if ($line === false) break;
$cp = strpos($line, ',', 25);
$yr = (int) substr($line, $cp + 1, 4);
if ($yr < $minYear) $minYear = $yr;
if ($yr > $maxYear) $maxYear = $yr;
}
fclose($fp);
$startYear = $minYear - 1;
$endYear = $maxYear + 1;

// Pre-compute date lookup: 8-char "YY-MM-DD" → int ID (chronological order)
$dateIds = [];
$datePrefixes = [];
$dateCount = 0;

for ($y = $startYear; $y <= $endYear; $y++) {
$ys = str_pad((string) ($y % 100), 2, '0', STR_PAD_LEFT);
for ($m = 1; $m <= 12; $m++) {
$ms = $m < 10 ? "0$m" : (string) $m;
$dim = match ($m) {
1, 3, 5, 7, 8, 10, 12 => 31,
4, 6, 9, 11 => 30,
2 => $y % 4 === 0 && ($y % 100 !== 0 || $y % 400 === 0) ? 29 : 28,
};
for ($d = 1; $d <= $dim; $d++) {
$ds = $d < 10 ? "0$d" : (string) $d;
$dateIds["$ys-$ms-$ds"] = $dateCount;
$datePrefixes[$dateCount] = " \"$y-$ms-$ds\": ";
$dateCount++;
}
}
}

$numWorkers = min(8, max(1, (int) ceil($fileSize / 262144)));

if ($numWorkers <= 1) {
$result = $this->processChunk($inputPath, 0, $fileSize, $dateIds, $dateCount);
$this->writeOutput($outputPath, $result, $datePrefixes, $dateCount);
return;
}

$chunkSize = (int) ceil($fileSize / $numWorkers);
$tmpPrefix = sys_get_temp_dir() . '/100m_' . getmypid() . '_';
$pids = [];

for ($w = 0; $w < $numWorkers - 1; $w++) {
$pid = pcntl_fork();
if ($pid === 0) {
$r = $this->processChunk(
$inputPath, $w * $chunkSize, ($w + 1) * $chunkSize,
$dateIds, $dateCount,
);
$this->writeWorkerResult($tmpPrefix . $w, $r, $dateCount);
exit(0);
}
$pids[] = $pid;
}

$parentResult = $this->processChunk(
$inputPath, ($numWorkers - 1) * $chunkSize, $fileSize,
$dateIds, $dateCount,
);

foreach ($pids as $pid) {
pcntl_waitpid($pid, $status);
}

// Merge
$globalIds = [];
$globalOrder = [];
$gpc = 0;
$merged = array_fill(0, 300 * $dateCount, 0);

for ($w = 0; $w < $numWorkers - 1; $w++) {
$this->mergeWorkerResult($tmpPrefix . $w, $dateCount, $globalIds, $globalOrder, $gpc, $merged);
}

// Merge parent
$pCounts = $parentResult['counts'];
foreach ($parentResult['paths'] as $lp => $path) {
if (!isset($globalIds[$path])) {
$globalIds[$path] = $gpc;
$globalOrder[] = $path;
$gpc++;
}
$gBase = $globalIds[$path] * $dateCount;
$lBase = $lp * $dateCount;
for ($d = 0; $d < $dateCount; $d++) {
$merged[$gBase + $d] += $pCounts[$lBase + $d];
}
}

$this->writeOutput(
$outputPath,
['paths' => $globalOrder, 'counts' => $merged, 'pc' => $gpc],
$datePrefixes, $dateCount,
);
}

private function processChunk(string $inputPath, int $startOffset, int $endOffset, array &$dateIds, int $dateCount): array
{
$fp = fopen($inputPath, 'r');
stream_set_read_buffer($fp, 0);

if ($startOffset > 0) {
fseek($fp, $startOffset - 1);
if (fread($fp, 1) !== "\n") {
fgets($fp);
}
}

$pathIds = [];
$pathOrder = [];
$pathCount = 0;
$counts = array_fill(0, 300 * $dateCount, 0);
$remaining = '';

while (($fpPos = ftell($fp)) < $endOffset) {
$chunk = fread($fp, min(4194304, $endOffset - $fpPos));
if ($chunk === false || $chunk === '') break;

if ($remaining !== '') {
$chunk = $remaining . $chunk;
$remaining = '';
}

$lastNl = strrpos($chunk, "\n");
if ($lastNl === false) {
$remaining = $chunk;
continue;
}

if ($lastNl < strlen($chunk) - 1) {
$remaining = substr($chunk, $lastNl + 1);
}

// Loop unrolled x8 with fence guard
$pos = 0;
$fence = $lastNl - 1000;

while ($pos < $fence) {
$c = strpos($chunk, ',', $pos + 25); $p = substr($chunk, $pos + 25, $c - $pos - 25); $b = $pathIds[$p] ?? -1; if ($b === -1) { $b = $pathCount * $dateCount; $pathIds[$p] = $b; $pathOrder[] = $p; $pathCount++; } $counts[$b + $dateIds[substr($chunk, $c + 3, 8)]]++; $pos = $c + 27;
$c = strpos($chunk, ',', $pos + 25); $p = substr($chunk, $pos + 25, $c - $pos - 25); $b = $pathIds[$p] ?? -1; if ($b === -1) { $b = $pathCount * $dateCount; $pathIds[$p] = $b; $pathOrder[] = $p; $pathCount++; } $counts[$b + $dateIds[substr($chunk, $c + 3, 8)]]++; $pos = $c + 27;
$c = strpos($chunk, ',', $pos + 25); $p = substr($chunk, $pos + 25, $c - $pos - 25); $b = $pathIds[$p] ?? -1; if ($b === -1) { $b = $pathCount * $dateCount; $pathIds[$p] = $b; $pathOrder[] = $p; $pathCount++; } $counts[$b + $dateIds[substr($chunk, $c + 3, 8)]]++; $pos = $c + 27;
$c = strpos($chunk, ',', $pos + 25); $p = substr($chunk, $pos + 25, $c - $pos - 25); $b = $pathIds[$p] ?? -1; if ($b === -1) { $b = $pathCount * $dateCount; $pathIds[$p] = $b; $pathOrder[] = $p; $pathCount++; } $counts[$b + $dateIds[substr($chunk, $c + 3, 8)]]++; $pos = $c + 27;
$c = strpos($chunk, ',', $pos + 25); $p = substr($chunk, $pos + 25, $c - $pos - 25); $b = $pathIds[$p] ?? -1; if ($b === -1) { $b = $pathCount * $dateCount; $pathIds[$p] = $b; $pathOrder[] = $p; $pathCount++; } $counts[$b + $dateIds[substr($chunk, $c + 3, 8)]]++; $pos = $c + 27;
$c = strpos($chunk, ',', $pos + 25); $p = substr($chunk, $pos + 25, $c - $pos - 25); $b = $pathIds[$p] ?? -1; if ($b === -1) { $b = $pathCount * $dateCount; $pathIds[$p] = $b; $pathOrder[] = $p; $pathCount++; } $counts[$b + $dateIds[substr($chunk, $c + 3, 8)]]++; $pos = $c + 27;
$c = strpos($chunk, ',', $pos + 25); $p = substr($chunk, $pos + 25, $c - $pos - 25); $b = $pathIds[$p] ?? -1; if ($b === -1) { $b = $pathCount * $dateCount; $pathIds[$p] = $b; $pathOrder[] = $p; $pathCount++; } $counts[$b + $dateIds[substr($chunk, $c + 3, 8)]]++; $pos = $c + 27;
$c = strpos($chunk, ',', $pos + 25); $p = substr($chunk, $pos + 25, $c - $pos - 25); $b = $pathIds[$p] ?? -1; if ($b === -1) { $b = $pathCount * $dateCount; $pathIds[$p] = $b; $pathOrder[] = $p; $pathCount++; } $counts[$b + $dateIds[substr($chunk, $c + 3, 8)]]++; $pos = $c + 27;
}

// Handle remaining lines near boundary
while ($pos < $lastNl) {
$c = strpos($chunk, ',', $pos + 25);
if ($c === false || $c + 26 > $lastNl) break;
$p = substr($chunk, $pos + 25, $c - $pos - 25);
$b = $pathIds[$p] ?? -1;
if ($b === -1) { $b = $pathCount * $dateCount; $pathIds[$p] = $b; $pathOrder[] = $p; $pathCount++; }
$counts[$b + $dateIds[substr($chunk, $c + 3, 8)]]++;
$pos = $c + 27;
}
}

// Handle remaining partial line
if ($remaining !== '') {
$rest = fgets($fp);
if ($rest !== false) {
$remaining .= $rest;
}
$remaining = rtrim($remaining, "\n\r");
if (strlen($remaining) > 25) {
$c = strpos($remaining, ',', 25);
if ($c !== false) {
$p = substr($remaining, 25, $c - 25);
$b = $pathIds[$p] ?? -1;
if ($b === -1) { $b = $pathCount * $dateCount; $pathIds[$p] = $b; $pathOrder[] = $p; $pathCount++; }
$counts[$b + $dateIds[substr($remaining, $c + 3, 8)]]++;
}
}
}

fclose($fp);
return ['counts' => $counts, 'paths' => $pathOrder, 'pc' => $pathCount];
}

private function writeWorkerResult(string $file, array $result, int $dateCount): void
{
$pc = $result['pc'];
$buf = pack('V', $pc);
foreach ($result['paths'] as $p) {
$buf .= pack('v', strlen($p)) . $p;
}
$total = $pc * $dateCount;
$counts = $result['counts'];
for ($i = 0; $i < $total; $i += 8192) {
$buf .= pack('V*', ...array_slice($counts, $i, min(8192, $total - $i)));
}
file_put_contents($file, $buf);
}

private function mergeWorkerResult(string $file, int $dateCount, array &$globalIds, array &$globalOrder, int &$gpc, array &$merged): void
{
$raw = file_get_contents($file);
unlink($file);

$off = 0;
$pc = unpack('V', $raw, $off)[1];
$off += 4;

$remap = [];
for ($i = 0; $i < $pc; $i++) {
$pl = unpack('v', $raw, $off)[1];
$off += 2;
$p = substr($raw, $off, $pl);
$off += $pl;
if (!isset($globalIds[$p])) {
$globalIds[$p] = $gpc;
$globalOrder[] = $p;
$gpc++;
}
$remap[$i] = $globalIds[$p];
}

for ($lp = 0; $lp < $pc; $lp++) {
$gBase = $remap[$lp] * $dateCount;
$chunk = unpack('V' . $dateCount, $raw, $off);
$off += $dateCount * 4;
$idx = 1;
for ($d = 0; $d < $dateCount; $d++) {
$merged[$gBase + $d] += $chunk[$idx++];
}
}
}

private function writeOutput(string $outputPath, array $result, array &$datePrefixes, int $dateCount): void
{
$out = fopen($outputPath, 'w');
stream_set_write_buffer($out, 2 << 20);
fwrite($out, "{\n");

$counts = $result['counts'];
$first = true;

foreach ($result['paths'] as $pathIdx => $path) {
$block = '';
if (!$first) $block = ",\n";
$first = false;

$block .= ' "\/blog\/' . $path . '": {' . "\n";

$base = $pathIdx * $dateCount;
$firstDate = true;

for ($d = 0; $d < $dateCount; $d++) {
$c = $counts[$base + $d];
if ($c > 0) {
if (!$firstDate) $block .= ",\n";
$firstDate = false;
$block .= $datePrefixes[$d] . $c;
}
}

$block .= "\n }";
fwrite($out, $block);
}

fwrite($out, "\n}");
fclose($out);
}
}
}