我有一个我运行的脚本，它执行了很多任务并且经历了大约21k次。问题是每个索引我做了几件不同的事情，每个索引都是我们数据库中的产品，我通过从API获取数据并保存产品等来更新价格。我有几个区域，几乎每个方法调用之前和之后我都调用了memory_get_usage()，而我所拥有的每个人似乎都增加了内存。没有一个比其他人做得更多或者没有那么明显。
我试图在循环的底部取消设置我的所有变量，并尝试将它们设置为null，但无论内存限制在每次迭代中不断提高。
我能做些什么来清除这个记忆，我会认为取消设置变量是为了释放内存，但它似乎没有这样做？
编辑： 我忘了提到我开始调查的原因是我在服务器上遇到了内存限制错误。它并不总是发生在同一点，甚至不是每次运行时都会发生。这就是我试图调查它的原因。
该脚本需要大约一个小时才能运行，我在早上运行它时没有其他任何事情发生，现在它只在登台服务器上运行，所以确实没有人打到服务器。
我可以发布代码，但它非常大
<?php
if( !function_exists('memory_get_usage') ){
include('function.php');
}
echo "At the start we're using (in bytes): ",
memory_get_usage() , "\n\n";
$path = realpath(dirname(__FILE__) . '/../../../../Mage.php');
require_once($path);
Mage::app();
require_once '/lib/ProductUpdate.php';
echo "Starting product update process \n\n";
$productUpdate = new ProductUpdate();
$dealerStoreId = 3;
$volumeDiscountGroupId = 4;
$retailGroupId = Mage_Customer_Model_Group::CUST_GROUP_ALL;
$wholesaleGroupId = 2;
echo "Grabbing all products \n\n";
Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);
// get the products from the InOrder stored procedure qty since datetime and don't pass a date to get all products, also pass the id of the cron job
$ioProducts = $productUpdate->getProductUpdateProducts('WEB2');
echo "---------------------------\n\n";
echo "Begin Updating Products \n\n";
echo "---------------------------\n\n";
$productCount = 0;
$productUpdate->saveScriptStarted(2);
echo "Before we go into the initial loop we are using (in bytes): ",
memory_get_usage() , "\n\n";
foreach ($ioProducts as $ioProduct) {
$updateProduct = false;
$updateTierPrice = false;
$sku = trim($ioProduct['inp_short_item_number']) . trim($ioProduct['isc_SIZE']) . trim($ioProduct['isc_COLOR']);
echo "Checking item number " . $sku . " \n\n";
echo "Before Loading Product " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
$product = $productUpdate->getProduct();
$productId = $product->getIdBySku($sku);
echo "After Getting Id from sku " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
if ($productId) {
//$product = $productUpdate->getProduct()->load($productId);
echo "After Loading Product " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
echo "WE HAVE A PRODUCT!: " . $product->getName() . "\n\n";
try {
echo "Before Getting Additional Info from InOrder for Product " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
// Since the product is same for parent products as it is for children you should just be able to get the price of the parent and use that.
$additionalInfo = $productUpdate->getItemDetails($ioProduct['inp_short_item_number'], 'WEB2');
echo "After Getting Additional Info from InOrder for Product " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
echo "Before Getting Extra Charges from InOrder for Product " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
$oversizeCharge = $productUpdate->getExtraCharges($ioProduct['inp_short_item_number']);
echo "After Getting Extra Charges from InOrder for Product " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
} catch (Exception $e) {
echo $e->getMessage() . "\n\n";
continue;
}
if (is_array($additionalInfo) && count($additionalInfo) > 0) {
if (isset($oversizeCharge[0]['Shipping Unit Charge']) && $product->getOversizeCharge() != $oversizeCharge[0]['Shipping Unit Charge']) {
$product->setOversizeCharge($oversizeCharge[0]['Shipping Unit Charge']);
$updateProduct = true;
unset($oversizeCharge);
}
if ($product->getPrice() != $additionalInfo[0]['pri_current_price']) {
$product->setPrice($additionalInfo[0]['pri_current_price']);
$updateProduct = true;
unset($additionalInfo);
}
echo "Before Setting Stock Status for Product " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
$product = $productUpdate->setStockStatus($product, $ioProduct);
echo "After Setting Stock Status for Product " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
if ($product->getNeedsUpdate()) {
$updateProduct = true;
}
if ($updateProduct) {
try{
echo "Before Saving Product " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
$productUpdate->saveProduct($product, $ioProduct);
echo "After Saving Product " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
}catch (Exception $e){
echo $e->getMessage() . "\n\n";
continue;
}
}
// Go through and do the same thing for the other 2 web classes to set pricing for the Dealer and Volume wholesale customers
$updateProduct = false;
try {
echo "Before getting Tier Price info for " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
$product = $productUpdate->getProduct()->setStoreId($dealerStoreId)->load($productId);
$additionalInfo = $productUpdate->getItemDetails($ioProduct['inp_short_item_number'], 'WEB3');
//$additionalTierInfo = $productUpdate->getItemDetails($ioProduct['inp_short_item_number'], 'WEB4');
// Get Real Tier Prices based on Customer Type
$retailPriceBreaks = $productUpdate->getItemPriceBreaks($ioProduct['inp_short_item_number'], Mage::getStoreConfig(Lancaster_InOrder_Helper_Data::XML_PATH_RETAIL_PRICE_LIST));
$wholesalePriceBreaks = $productUpdate->getItemPriceBreaks($ioProduct['inp_short_item_number'], Mage::getStoreConfig(Lancaster_InOrder_Helper_Data::XML_PATH_WHOLESALE_PRICE_LIST));
$volumeWholesalePriceBreaks = $productUpdate->getItemPriceBreaks($ioProduct['inp_short_item_number'], Mage::getStoreConfig(Lancaster_InOrder_Helper_Data::XML_PATH_VOLUME_WHOLESALE_PRICE_LIST));
echo "After getting Tier Price infor for " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
} catch (Exception $e) {
echo $e->getMessage() . "\n\n";
continue;
}
if ($product->getPrice() != $additionalInfo[0]['pri_current_price']) {
$product->setPrice($additionalInfo[0]['pri_current_price']);
$updateProduct = true;
}
//The only way to setup multiple price for one website is to set a tier price so we set it to a specific group and the dealer site then go through and set all the other real tier prices
$tierPriceInfo = $product->getData('tier_price');
if (!empty($tierPriceInfo)) {
echo "Before looping through Tier Price infor for " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
foreach ($tierPriceInfo as $tierPrice) {
if ($tierPrice["website_id"] == $dealerStoreId &&
$tierPrice["cust_group"] == $volumeDiscountGroupId &&
$tierPrice["price_qty"] == '1' &&
$tierPrice["price"] != $additionalTierInfo[0]['pri_current_price']) {
$updateTierPrice = true;
}
//todo need to do some refinement to the following, was rushed to put out the logic need to fix so it doesn't update everytime
// need to find if any of the tier prices do not match price as well if there is a price break in InOrder but not in Magento
if (!$updateTierPrice ) {
$updateRetail = isUpdateTierPrices($retailPriceBreaks, $tierPrice, $retailGroupId);
$updateWholesale = isUpdateTierPrices($wholesalePriceBreaks, $tierPrice, $wholesaleGroupId);
$updateVolWholesale = isUpdateTierPrices($volumeWholesalePriceBreaks, $tierPrice, $volumeDiscountGroupId);
if (
(count($retailPriceBreaks) > 0 && !$updateRetail['priceTierExists']) &&
(count($wholesalePriceBreaks) > 0 && !$updateWholesale['priceTierExists']) &&
(count($volumeWholesalePriceBreaks) > 0 && !$updateVolWholesale['priceTierExists'])) {
$updateTierPrice = true;
}
if(($updateRetail['updateTierPrice'] || $updateWholesale['updateTierPrice'] || $updateVolWholesale['updateTierPrice'])){
$updateTierPrice = true;
}
}
}
unset($tierPriceInfo);
echo "After looping through Tier Price infor for " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
}
else {
$updateTierPrice = true;
}
if ($updateTierPrice) {
echo "Before setting whether we update Tier Price for " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
//construct the tier price
$website_id = Mage::getModel('core/store')->load($dealerStoreId)->getWebsiteId();
$tierPrices = array(array(
'website_id' => $website_id,
'cust_group' => $volumeDiscountGroupId,
'price_qty' => '1',
'price' => $additionalTierInfo[0]['pri_current_price']
));
updateTierPrices($retailPriceBreaks, $retailGroupId, $tierPrices);
updateTierPrices($wholesalePriceBreaks, $wholesaleGroupId, $tierPrices);
updateTierPrices($volumeWholesalePriceBreaks, $volumeDiscountGroupId, $tierPrices);
$product->setData('tier_price', $tierPrices);
$updateProduct = true;
unset($website_id);
echo "After setting whether we update Tier Price for " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
}
if ($updateProduct) {
try{
echo "Before saving product for Tiered Pricing for " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
// $productUpdate->saveProduct($product, $ioProduct);
echo "After saving product for Tiered Pricing for " . $sku . " we are using (in bytes): ",
memory_get_usage() , "\n\n";
}catch (Exception $e){
echo $e->getMessage() . "\n\n";
continue;
}
}
}
}
$retailPriceBreaks = null;
$wholesalePriceBreaks = null;
$volumeWholesalePriceBreaks = null;
$oversizeCharge = null;
$additionalTierInfo = null;
$additionalInfo = null;
$product = null;
$productCount++;
echo $productCount . " Products have been proceessed \n\n";
}
echo "After running through all products we are using (in bytes): ",
memory_get_usage() , "\n\n";
echo "Peak memory usage for product update scrip (in bytes): ",
memory_get_peak_usage() , "\n\n";
答案 0 :(得分：5)
增加PHP的内存使用率是正常的。取消设置变量并不会立即释放它所占用的内存，它只是将其标记为可以重复使用。在某些时候，PHP会决定应该运行垃圾收集器，那就是内存真正被释放的时候。
除非你真的遇到“内存不足”的致命错误，否则无需担心。 PHP尽最大努力防止OOM发生，但每次取消设置变量时都不会进行非常昂贵的垃圾收集运行。如果发生这种情况，表演将彻底停止。
答案 1 :(得分：0)
在没有看到您的代码的情况下，我的猜测是PHP的垃圾收集（释放未使用的内存）不会在脚本运行时运行。
故事情节，这种行为是可以接受和预期的。只要你没有得到任何内存不足的错误，你应该没问题。