> -----Original Message----- > From: Linux on 390 Port [mailto:linux-...@vm.marist.edu] On > Behalf Of Edmund R. MacKenty > Sent: Friday, November 13, 2009 4:05 PM > To: LINUX-390@VM.MARIST.EDU > Subject: Re: weird(?) idea for an extended symlink functionality <snip> > I thought the original poster rejected the idea of named > pipes because of > concern about the I/O overhead? Named pipes are the > UNIX-style solution to > this problem, but can they match the performance of a > concatenated dataset? > Is the I/O overhead of pipes significant in this context? > - MacK. > ----- > Edmund R. MacKenty
I think you're right. He was worried that instead of his program just reading the file(s), the I/O would be: (1) "cat" reading the files from disk; (2)writing the contents to the pipe and (3) his program reading the pipe. Or about 3x the I/O. But pipes are not hardened to disk (ignoring paging?), so it is more like a VIO dataset in z/OS (VIO datasets are written to memory only). Well, it is weekend time for me! Thanks to all for the education. -- John McKown Systems Engineer IV IT Administrative Services Group HealthMarkets(r) 9151 Boulevard 26 * N. Richland Hills * TX 76010 (817) 255-3225 phone * (817)-961-6183 cell john.mck...@healthmarkets.com * www.HealthMarkets.com Confidentiality Notice: This e-mail message may contain confidential or proprietary information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. HealthMarkets(r) is the brand name for products underwritten and issued by the insurance subsidiaries of HealthMarkets, Inc. -The Chesapeake Life Insurance Company(r), Mid-West National Life Insurance Company of TennesseeSM and The MEGA Life and Health Insurance Company.SM ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
