SSD causing 100% CPU usage in Apache/PHP
- by Tim Reynolds
I wanted to increase the performance on my development laptop so I added an Intel 320 Series SSD as my primary drive. Everything is amazingly fast, as expected, except Apache/PHP.
I develop Magento by using an Ubuntu 10.10 virtual machine.
Information:
Host OS: Win 7 Professional 64bit
Guest OS: Ubuntu 10.10 32bit
Processor: i7
Chipset QM55
SSD: Intel 320 Series 160gb 30% full
HDD: Hitachi 320gb 50% full (in side bay using an adapter)
Laptop: Lenovo T510
Using: Shared folders
Apache Version: 2.2.16
PHP Version: 5.3.3-1
APC Version: 3.1.3p1
APC Memory: 128M
Using tmpfs for cache, log, session directories in Magento
In the VM running on the SSD (VM files and source files are on the same drive) loading a product page in the Admin takes on average 26.2 seconds and uses 100% CPU for nearly the entire time.
In the VM running on the old HDD loading the same page takes on average 4.4 seconds. It mostly uses around 40-50% of the CPU while rendering the page.
I have read this post: Performance issues when using SSD for a developer notebook (WAMP/LAMP stack)?
It says to change some settings in the bios. I have turned any and all power management features off in the bios. I can't for the life of me understand why this would be happening.
