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MDL-72596 core_cache: Track cache I/O size in perfdebug

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For cache types which mean this information can be obtained without a
significant performance cost (i.e. just by calling strlen and not
having to serialize something that wasn't serialized already),
this change calculates the size of data read from or written to cache
in each request and includes it in the perfdebug table at bottom of
output (when that is turned on).

This supports the following cache types:

* File store
* Redis (only if caching is enabled)
This commit is contained in:
sam marshall
2021-10-19 17:00:48 +01:00
parent 1a9bee69e6
commit 9c29979b8b
10 changed files with 286 additions and 26 deletions
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cache/classes/loaders.php
Vendored
+31 -14
View File
@@ -445,7 +445,8 @@ class cache implements cache_loader {
}
$setaftervalidation = ($result !== false);
} else if ($this->perfdebug) {
cache_helper::record_cache_hit($this->store, $this->definition);
$readbytes = $this->store->get_last_io_bytes();
cache_helper::record_cache_hit($this->store, $this->definition, 1, $readbytes);
}
// 5. Validate strictness.
if ($strictness === MUST_EXIST && $result === false) {
@@ -492,6 +493,7 @@ class cache implements cache_loader {
$resultpersist = array();
$resultstore = array();
$keystofind = array();
$readbytes = cache_store::IO_BYTES_NOT_SUPPORTED;
// First up check the persist cache for each key.
$isusingpersist = $this->use_static_acceleration();
@@ -515,6 +517,9 @@ class cache implements cache_loader {
// Next assuming we didn't find all of the keys in the persist cache try loading them from the store.
if (count($keystofind)) {
$resultstore = $this->store->get_many(array_keys($keystofind));
if ($this->perfdebug) {
$readbytes = $this->store->get_last_io_bytes();
}
// Process each item in the result to "unwrap" it.
foreach ($resultstore as $key => $value) {
if ($value instanceof cache_ttl_wrapper) {
@@ -599,7 +604,7 @@ class cache implements cache_loader {
$hits++;
}
}
cache_helper::record_cache_hit($this->store, $this->definition, $hits);
cache_helper::record_cache_hit($this->store, $this->definition, $hits, $readbytes);
cache_helper::record_cache_miss($this->store, $this->definition, $misses);
}
@@ -625,9 +630,6 @@ class cache implements cache_loader {
* @return bool True on success, false otherwise.
*/
public function set($key, $data) {
if ($this->perfdebug) {
cache_helper::record_cache_set($this->store, $this->definition);
}
if ($this->loader !== false) {
// We have a loader available set it there as well.
// We have to let the loader do its own parsing of data as it may be unique.
@@ -654,7 +656,12 @@ class cache implements cache_loader {
}
$parsedkey = $this->parse_key($key);
return $this->store->set($parsedkey, $data);
$success = $this->store->set($parsedkey, $data);
if ($this->perfdebug) {
cache_helper::record_cache_set($this->store, $this->definition, 1,
$this->store->get_last_io_bytes());
}
return $success;
}
/**
@@ -781,7 +788,8 @@ class cache implements cache_loader {
}
$successfullyset = $this->store->set_many($data);
if ($this->perfdebug && $successfullyset) {
cache_helper::record_cache_set($this->store, $this->definition, $successfullyset);
cache_helper::record_cache_set($this->store, $this->definition, $successfullyset,
$this->store->get_last_io_bytes());
}
return $successfullyset;
}
@@ -1845,6 +1853,9 @@ class cache_session extends cache {
if ($result instanceof cache_cached_object) {
$result = $result->restore_object();
}
if ($this->perfdebug) {
$readbytes = $this->get_store()->get_last_io_bytes();
}
}
// 4. Load if from the loader/datasource if we don't already have it.
if ($result === false) {
@@ -1864,7 +1875,7 @@ class cache_session extends cache {
$this->set($key, $result);
}
} else if ($this->perfdebug) {
cache_helper::record_cache_hit($this->get_store(), $this->get_definition());
cache_helper::record_cache_hit($this->get_store(), $this->get_definition(), 1, $readbytes);
}
// 5. Validate strictness.
if ($strictness === MUST_EXIST && $result === false) {
@@ -1907,9 +1918,6 @@ class cache_session extends cache {
// We have to let the loader do its own parsing of data as it may be unique.
$loader->set($key, $data);
}
if ($this->perfdebug) {
cache_helper::record_cache_set($this->get_store(), $this->get_definition());
}
if (is_object($data) && $data instanceof cacheable_object) {
$data = new cache_cached_object($data);
} else if (!$this->get_store()->supports_dereferencing_objects() && !is_scalar($data)) {
@@ -1923,7 +1931,12 @@ class cache_session extends cache {
if ($this->has_a_ttl() && !$this->store_supports_native_ttl()) {
$data = new cache_ttl_wrapper($data, $this->get_definition()->get_ttl());
}
return $this->get_store()->set($this->parse_key($key), $data);
$success = $this->get_store()->set($this->parse_key($key), $data);
if ($this->perfdebug) {
cache_helper::record_cache_set($this->get_store(), $this->get_definition(), 1,
$this->get_store()->get_last_io_bytes());
}
return $success;
}
/**
@@ -1971,6 +1984,9 @@ class cache_session extends cache {
$keymap[$parsedkey] = $key;
}
$result = $this->get_store()->get_many($parsedkeys);
if ($this->perfdebug) {
$readbytes = $this->get_store()->get_last_io_bytes();
}
$return = array();
$missingkeys = array();
$hasmissingkeys = false;
@@ -2038,7 +2054,7 @@ class cache_session extends cache {
$hits++;
}
}
cache_helper::record_cache_hit($this->get_store(), $this->get_definition(), $hits);
cache_helper::record_cache_hit($this->get_store(), $this->get_definition(), $hits, $readbytes);
cache_helper::record_cache_miss($this->get_store(), $this->get_definition(), $misses);
}
return $return;
@@ -2116,7 +2132,8 @@ class cache_session extends cache {
}
$successfullyset = $this->get_store()->set_many($data);
if ($this->perfdebug && $successfullyset) {
cache_helper::record_cache_set($this->get_store(), $this->get_definition(), $successfullyset);
cache_helper::record_cache_set($this->get_store(), $this->get_definition(), $successfullyset,
$this->get_store()->get_last_io_bytes());
}
return $successfullyset;
}