Performance Tests
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This page contains some performance figures from my own testing of PHPA. Performance gains are dependent on many factors, and typical gains are at least two to three times speedup, although can be substantially more. The user testimonials also indicate the effectiveness of PHPA. The bottom of each page on this site also shows the PHP processing time and a link to the non-accelerated or accelerated page for comparison, and gives an indication of acceleration from PHPA in action Benchmarks of the Smarty templates system with and without acceleration using PHPA show that nearly 10 times acceleration from PHPA is possible on Smarty based applications. test from dynamicwebpages.de has a review of caches that includes an earlier version of the Accelerator. PHPA, APC, AfterBurner Comparisons A French site has produced a study of optimising by caching PHP, and gives another indication of the performance of PHPA compared to other caching systems. Load Average Charts The following load-average charts were contributed from a site running a comparison of the APC cache vs. PHPA. Note that the Y axis with load average is scaled differently for PHPA than for APC because the load average with PHPA is reduced, and so the effectiveness is even more than is aparant from the graphs. Despite the performance differences, it should be noted that APC is also a very good Acceleration tool, and, in the spirit of PHPA, also a non-commercial venture. Load Average using APC Load Average using PHPA Script Timings The following tests give performance indications from an earlier version of the Accelerator and the Zend Cache, now known as the Zend Accelerator. The tables below give a rough indication of possible performance gains from testing both single page loads and blasting the web server with a stream of concurrent requests using the Apache benchmarking tool. They also include comparisons with the fastest commercial product, the Zend Cache, highlighting the comparable performance. All tests bar one were on a machine with a 650Mhz Athlon and fast memory/bus. The 'odd one out' test was on the server rendering these pages and, whilst having a similar clock rate Celeron, is noticably slower overall. The hdparm tests for interests sake at the bottom of the page show the difference in disk and memory performance of the two machines. As the Accelerator eliminates some memory allocation and copying, this may account for better acceleration seen from the slower machine as its worse memory performance may be a bigger factor in the overall timing. Single page loads Script Without Accelerator Accelerator SHM cache disabled Accelerator SHM cache enabled Zend Cache Avg Accelerator Speedup /site1/index.php 0.0168 0.0101 0.0058 0.0056 2.9 /site1/index.php (Slower machine) 0.0230 unmeasured 0.0072 unmeasured 3.19 /site2/index.php 0.0659 0.0418 0.0289 0.0290 2.28 /site2/edit_profile.php 0.0388 0.0233 0.0155 0.0150 2.50 Apache Bench results with no cache, with the Accelerator, and with Zend Cache Document Path: /join.php Concurrency Level: 3 Time taken for tests: 9.000 seconds Complete requests: 100 Total transferred: 1252560 bytes HTML transferred: 1215330 bytes Requests per second: 11.11 Transfer rate: 137.81 kb/s received Connnection Times (ms)   min avg max Connect: 0 1 109 Processing: 79 266 650 Total: 79 267 759 Document Path: /join.php Concurrency Level: 3 Time taken for tests: 4.213 seconds Complete requests: 100 Total transferred: 1252560 bytes HTML transferred: 1215330 bytes Requests per second: 23.74 Transfer rate: 297.31 kb/s received Connnection Times (ms)   min avg max Connect: 0 0 0 Processing: 37 123 533 Total: 37 123 533 Document Path: /join.php Concurrency Level: 3 Time taken for tests: 4.191 seconds Complete requests: 100 Total transferred: 1252560 bytes HTML transferred: 1215330 bytes Requests per second: 23.86 Transfer rate: 298.87 kb/s received Connnection Times (ms)   min avg max Connect: 0 2 76 Processing: 36 122 330 Total: 36 124 406 Document Path: /index.php Concurrency Level: 4 Time taken for tests: 2.665 seconds Complete requests: 100 Total transferred: 362972 bytes HTML transferred: 345977 bytes Requests per second: 37.52 Transfer rate: 136.20 kb/s received Connnection Times (ms)   min avg max Connect: 0 0 0 Processing: 22 104 351 Total: 22 104 351 Document Path: /index.php Concurrency Level: 4 Time taken for tests: 1.025 seconds Complete requests: 100 Total transferred: 362972 bytes HTML transferred: 345977 bytes Requests per second: 97.56 Transfer rate: 354.12 kb/s received Connnection Times (ms)   min avg max Connect: 0 9 27 Processing: 19 27 236 Total: 19 36 263 Document Path: /index.php Concurrency Level: 4 Time taken for tests: 1.005 seconds Complete requests: 100 Total transferred: 362972 bytes HTML transferred: 345977 bytes Requests per second: 99.50 Transfer rate: 361.17 kb/s received Connnection Times (ms)   min avg max Connect: 0 10 26 Processing: 10 26 160 Total: 10 36 186 hdparm tests from the Celeron and Athlon boxes /dev/hda: Timing buffer-cache reads: 128 MB in 1.59 seconds = 80.50 MB/sec Timing buffered disk reads: 64 MB in 2.77 seconds = 23.10 MB/sec /dev/hda: Timing buffer-cache reads: 128 MB in 0.80 seconds =160.00 MB/sec Timing buffered disk reads: 64 MB in 1.83 seconds = 34.97 MB/sec

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