Whatever Jochem....you get the point....a simple page load test with some queries etc. has nothing to do with the thread....it was a SPECIFIC performance issue.
I bow down to your superior knowledge and use of semantics ;-) Cheers On Wed, 2010-10-20 at 09:56 +0200, Jochem van Dieten wrote: > On Tue, Oct 19, 2010 at 10:51 PM, Bryan Stevenson wrote: > > Respectfully Ketan....your tests have nothing to do with the string > > concatenation performance issue that was the crux of this thread ;-) > > I very much doubt the performance issue discussed here has anything to > do with string concatenation. > > <cffile action='append'...> appends code to the file on the file > system. That means it waits until the data hits the disks. If you pull > the plug after 10K lines, you will have a file with 10K lines on the > filesystem when it comes back up. With a 15K RPM disk the rotational > latency alone limits you to 250 operations per second. So 20K lines > takes about 80 seconds. (If you test this you will frequently see > higher performance numbers which is due to write caching not in the OS > but on the disk. SAS disks typically allow you to disable that.) > > <cfset this.FileObject.write(arguments.fileData,0, > len(arguments.fileData))> doesn't write to disk, it writes to a JVM > buffer. Only the final FileObject.flush() writes the buffer to disk. > If you pull the plug after 10K lines, you will have a file with 0 > lines on the filesystem when it comes back up. > > > That your PHP code runs in about 8 seconds simply means it does string > concatenation in memory followed by one write as well. Either > explicitly in a PHP memory variable or implicitly by not doing a real > fsync after writing to the filesystem. > > Jochem > Bryan Stevenson B.Comm. VP & Director of E-Commerce Development Electric Edge Systems Group Inc. phone: 250.480.0642 fax: 250.480.1264 cell: 250.920.8830 e-mail: br...@electricedgesystems.com web: www.electricedgesystems.com Notice: This message, including any attachments, is confidential and may contain information that is privileged or exempt from disclosure. It is intended only for the person to whom it is addressed unless expressly authorized otherwise by the sender. If you are not an authorized recipient, please notify the sender immediately and permanently destroy all copies of this message and attachments. Please consider the environment before printing this e-mail ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Order the Adobe Coldfusion Anthology now! http://www.amazon.com/Adobe-Coldfusion-Anthology/dp/1430272155/?tag=houseoffusion Archive: http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:338369 Subscription: http://www.houseoffusion.com/groups/cf-talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/groups/cf-talk/unsubscribe.cfm
