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Friday, October 26, 2012. Our team met a problem of the "infamous" ext3 slowless on fsync() calls. We solved it rather easily by switching to ext4. But one might ask, WTF is going on with ext3 fsync() performance? And why simply switching to ext4 solves it at all? I googled some time but found no obvious explanations nor documents about why ext4 outperforms ext3 in fsync-workloads. So I had to do it RTFC way. OTOH, ext4 (with default options) doesn't have such problem. Ext3/4 both implements this data=or...

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Tech rider | bardofschool.blogspot.com Reviews

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Friday, October 26, 2012. Our team met a problem of the infamous ext3 slowless on fsync() calls. We solved it rather easily by switching to ext4. But one might ask, WTF is going on with ext3 fsync() performance? And why simply switching to ext4 solves it at all? I googled some time but found no obvious explanations nor documents about why ext4 outperforms ext3 in fsync-workloads. So I had to do it RTFC way. OTOH, ext4 (with default options) doesn't have such problem. Ext3/4 both implements this data=or...

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Tech rider | bardofschool.blogspot.com Reviews

https://bardofschool.blogspot.com

Friday, October 26, 2012. Our team met a problem of the "infamous" ext3 slowless on fsync() calls. We solved it rather easily by switching to ext4. But one might ask, WTF is going on with ext3 fsync() performance? And why simply switching to ext4 solves it at all? I googled some time but found no obvious explanations nor documents about why ext4 outperforms ext3 in fsync-workloads. So I had to do it RTFC way. OTOH, ext4 (with default options) doesn't have such problem. Ext3/4 both implements this data=or...

INTERNAL PAGES

bardofschool.blogspot.com

1

Tech rider: CLSF 2011 - Day 2

http://bardofschool.blogspot.com/2011/11/clsf-2011-day-2.html

Tuesday, November 1, 2011. CLSF 2011 - Day 2. The second day of CLSF 2011. Started with Wu Fengguang's IO-less throttling. It is a continuous work from last year. Fengguang has done great work in improving Linux kernel read-ahead. And in the last two years, he is working on improving writeback. 1 let dirtier task sleep instead of initiate writeback in balance dirty pages(), so flusher can start writeback when necessary;. From Baidu, commented that swap is on in their deployment. Only small databases ...

2

Tech rider: May 2012

http://bardofschool.blogspot.com/2012_05_01_archive.html

Monday, May 7, 2012. 2012 LSF/MM Summit Summary - Day 2. The second day of LSF/MM summit started with flash media led by Steven Sprouse from SanDisk. He started with an introduction of lifetime terabyte writes, which is defined as:. Physical capacity * write endurance LTW = - - - - - - - - - - - - - - - - - - - write amplification. Another point made by Sprouse is the definition of "random write". Different hardware has different capability of handling random write. For flash, anything smaller th...1 OS ...

3

Tech rider: CLFS 2010

http://bardofschool.blogspot.com/2011/09/clfs-2010.html

Thursday, September 1, 2011. I wasn't able to write down the details about CLFS (China Linux Filesystem and Storage workshop) last year (too busy at that time.). But luckily, I have written this slide to recode the major events in it. Here it is. Posted by Peng Tao. Subscribe to: Post Comments (Atom). For now, Im trying to make a living by coding. View my complete profile. Virtual Machine File System.

4

Tech rider: May 2009

http://bardofschool.blogspot.com/2009_05_01_archive.html

Tuesday, May 12, 2009. Libevent and so on. Since we need a HTTP server to provide efficient service to all kinds of clients, I started to look into some lightweight open source solutions. The first item that jumps into my eyes is libevent. Because I happen to read a blog. Of a facebook developer's, stating that facebook is using libevent as a HTTP server in their haystack photo storage service. Event method: %s n. Event base get method. Error binding http server to port %d n. Set callback for "/" */.

5

Tech rider: CLSF 2011 - Day 1

http://bardofschool.blogspot.com/2011/11/clsf-2011-day-1.html

Tuesday, November 1, 2011. CLSF 2011 - Day 1. One year passed since last CLSF2010. In Shanghai. This year, CLSF is held in Nanjing and sponsored by Baidu and Fujitsu. And Coly. Has kindly built an official website. One defect of tree log is that, when writing new logs, it also writes all old logs (again and again). The solution is to assign a sub-transaction id to each log and use it to avoid writing old logs. And it improves performance in large file many fsync use case. The last but most important ques...

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bardofschool.blogspot.com

Tech rider

Friday, October 26, 2012. Our team met a problem of the "infamous" ext3 slowless on fsync() calls. We solved it rather easily by switching to ext4. But one might ask, WTF is going on with ext3 fsync() performance? And why simply switching to ext4 solves it at all? I googled some time but found no obvious explanations nor documents about why ext4 outperforms ext3 in fsync-workloads. So I had to do it RTFC way. OTOH, ext4 (with default options) doesn't have such problem. Ext3/4 both implements this data=or...

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