Bug #73324 [Opn->Fbk]: GD excessive memory usage

Edit report at https://bugs.php.net/bug.php?id=73324&edit=1 ID: 73324 Updated by: cmb@php.net Reported by: ch at aixit dot com Summary: GD excessive memory usage -Status: Open +Status: Feedback Type: Bug Package: GD related Operating System: * PHP Version: 7.0.12 -Assigned To: +Assigned To: cmb Block user comment: N Private report: N New Comment: A high memory consumption is to be expected when dealing with rather large images, because for truecolor images internally each pixel requires 32 bit, resulting in 8,699,840 bytes. When the image is scaled up to 3000*4243 pixels, the pixels consume 50,916,000 bytes. Because imagescale() creates a new image, both images will have to be retained in memory, until the assignment to $img (which will release the original image immediately). Considering this, the values reported by 7.0 appear pretty much to be expected. The values reported by 5.6 would be wrong, but it's not clear to me how you've measured these. memory_get_usage() and memory_get_peak_usage() report sane values for me (on Windows). Note also, that when PHP is built with a system libgd, the $real_usage parameter of these function would have to be set to TRUE; otherwise the memory used by libgd will not be properly reported, because it is not allocated by the Zend memory manager, but plain malloc() and friends. Previous Comments: ------------------------------------------------------------------------ [2016-10-14 18:14:19] ch at aixit dot com Description: ------------ # tested with different linux distros (debian8, centos6.5) # PHP 7.0 (tested with different versions of php 7.0) PHP VERSION: 7.0.12-1+jessie1 IMAGE FILESISE: 205.09K IMAGE FILETYPE: image/jpeg IMAGE DIMENSION: 1240x1754 MEMORY USE (CURRENT/PEAK): 355.20K / 1.42M $img = imagecreatefromjpeg($filename); MEMORY USE (CURRENT/PEAK): 17.01M / 17.01M $img = imagescale($img, 3000); MEMORY USE (CURRENT/PEAK): 65.61M / 82.26M # Same Imagefile with php 5.6 PHP VERSION: 5.6.26-0+deb8u1 MEMORY USE (CURRENT/PEAK): 230.26K / 504.37K $img = imagecreatefromjpeg($filename); MEMORY USE (CURRENT/PEAK): 230.51K / 504.37K $img = imagescale($img, 3000); MEMORY USE (CURRENT/PEAK): 230.51K / 504.37K # configure line './configure' '--prefix=/opt/php-7.0' '--with-config-file-path=/opt/php-7.0/etc' '--with-config-file-scan-dir=/opt/php-7.0/etc/conf-enabled' '--enable-fpm' '--with-fpm-systemd' '--with-imap=/usr' '--with-imap-ssl' '--with-kerberos' '--with-zlib-dir' '--with-freetype-dir' '--enable-mbstring' '--with-libxml-dir=/usr' '--enable-soap' '--with-curl=shared' '--with-mcrypt=shared' '--with-zlib' '--with-gd=shared' '--with-pdo-mysql' '--with-pdo-pgsql' '--with-mysql-sock=/var/run/mysqld/mysqld.sock' '--with-mysqli' '--enable-sockets' '--with-jpeg-dir=/usr' '--with-png-dir=/usr' '--enable-gd-native-ttf' '--with-openssl' '--with-openssl-dir=/usr' '--enable-inline-optimization' '--with-bz2' '--enable-sysvsem' '--enable-sysvshm' '--enable-sysvmsg' '--enable-pcntl' '--enable-mbregex' '--with-mhash' '--enable-zip' '--with-pcre-regex' '--enable-ftp' '--with-gettext' '--enable-calendar' '--enable-intl' '--enable-exif' '--enable-bcmath' '--enable-dba' '--enable-shmop' '--enable-wddx' '--with! -readline' '--with-ldap=shared' '--with-ldap-sasl' '--with-snmp=shared' '--with-xmlrpc=shared' '--with-mhash=shared' '--with-xsl=shared' '--with-pspell=shared' '--with-gmp=shared' '--with-tidy=shared' # Loaded modules apcu bcmath bz2 calendar Core ctype curl date dba dom exif fileinfo filter ftp gd gettext hash iconv imagick imapintl json ldap libxml mbstring mcrypt mysqli mysqlnd openssl pcntl pcre PDO pdo_mysql pdo_pgsql pdo_sqlite Phar posix readline Reflection session shmop SimpleXML snmp soap sockets SPL sqlite3 ssh2 standard sysvmsg sysvsem sysvshm tokenizer wddx xml xmlreader xmlwriter Zend OPcache zip zlib Zend OPcache Test script: --------------- <?php $filename = "test.jpg"; echo 'Memory usage:' . memory_get_usage() .PHP_EOL; $img = imagecreatefromjpeg($filename); echo 'Memory usage:' . memory_get_usage() .PHP_EOL; ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=73324&edit=1