http://www.cyberciti.biz/tips This is a Linux sys admin journal by Vivek about sys admin work, Linux tips & tricks, hacks, news and more. Fri, 03 Feb 2012 22:45:35 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 http://www.cyberciti.biz/tips/linux-hugetlbfs-and-mysql-performance.html http://www.cyberciti.biz/tips/linux-hugetlbfs-and-mysql-performance.html#comments Wed, 20 May 2009 07:59:39 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=4773 Applications that perform a lot of memory accesses (several GBs) may obtain performance improvements by using large pages due to reduced Translation Lookaside Buffer (TLB) misses. HugeTLBfs is memory management feature offered in Linux kernel, which is valuable for applications that use a large virtual address space. It is especially useful for database applications such as MySQL, Oracle and others. Other server software(s) that uses the prefork or similar (e.g. Apache web server) model will also benefit.

The CPU's Translation Lookaside Buffer (TLB) is a small cache used for storing virtual-to-physical mapping information. By using the TLB, a translation can be performed without referencing the in-memory page table entry that maps the virtual address. However, to keep translations as fast as possible, the TLB is usually small. It is not uncommon for large memory applications to exceed the mapping capacity of the TLB. Users can use the huge page support in Linux kernel by either using the mmap system call or standard SYSv shared memory system calls (shmget, shmat). ]]> http://www.cyberciti.biz/tips/linux-hugetlbfs-and-mysql-performance.html/feed 10 http://www.cyberciti.biz/tips/linux-nspr-and-nss-updates.html http://www.cyberciti.biz/tips/linux-nspr-and-nss-updates.html#comments Tue, 03 Jun 2008 09:42:04 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=2435 http://www.cyberciti.biz/tips/linux-nspr-and-nss-updates.html/feed 1 http://www.cyberciti.biz/tips/valgrind-linux-debugging-profiling-bugreporting.html http://www.cyberciti.biz/tips/valgrind-linux-debugging-profiling-bugreporting.html#comments Tue, 15 Apr 2008 20:21:36 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=2202 http://www.cyberciti.biz/tips/valgrind-linux-debugging-profiling-bugreporting.html/feed 0