Thanks to all who responded to my query. At least we now know why the problem is occurring, and we will try some internal z/linux tuning.
DJ --- DAVID JONES | MANAGING DIRECTOR FOR ZSYSTEMS SERVICES | z/VM, Linux, and Cloud 703.237.7370 (Office) | 281.578.7544 (CELL) INFORMATION TECHNOLOGY COMPANY [3] On 04.18.2018 1:16 PM, John Campbell wrote: > "This should not happen"... Never confuse theory with practice. > > In Software development, theory and practice appear identical. (BT,DT) > > In Systems Integration and Application Production Support you quickly learn > that theory and practice are seldom within the same galaxy much less the > same solar system. (BT,DT) > > I've done enough problem determination within BOTH environments... > > (chuckles) > > (Draws on memory) > > Running an IBM labspace I had three AIX servers for supporting testing of > an application that required SNA support. I also owned the delegated DNS > subdomain so it was up to me to recommend names. One server handled > functional testing, the second was for system testing and the final one for > "user" testing. I named them flog, flail and flaunt. (The SNA gateway was > named "phlegm", BTW, instead of "snaat".) > > In various places, beyond this, I have learned that "UAT" seems to stand > for "User Avoided Testing". > > I've also worked w/ Tandem guys who throw around claims like 5 nines... > and had the systems _I_ supported insulted as 9 fives servers. > > (shrugs) > > So I have a LOT of practice learning how systems DO NOT WORK AS EXPECTED. > > To paraphrase Patton's Law for this milieu... "No Plan Survives Contact > With Reality". > > -soup > > On Wed, Apr 18, 2018 at 3:01 PM, Christian Borntraeger < > [email protected]> wrote: > On 04/18/2018 03:36 PM, Dave Jones wrote: Hello, gang. I have a very simple > bash script that runs a trivial data collection task, and then does a Linux > "sleep im" to wait a minute before running the data collection task again. > Under very high CPU loads (> 90%) I have noticed that the "sleep" command > does not seem to wake up after one minute but instead wakes up 15 to 20 > minutes later. This is on a Red Hat 6.9 guest running under z/VM 6.4 on a z12 > box. I would like to buy a clue here if I could. This should not happen, even > under load. Is this really the sleep that does not wakeup or is maybe the > following stuff not getting access to the data? Have you tried with "set -x" > in the bash script to see what commands bash is executing? > ---------------------------------------------------------------------- For > LINUX-390 subscribe / signoff / archive access instructions, send email to > [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 [1] ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ [2] -- John R. Campbell Speaker to Machines souperb at gmail dot com MacOS X proved it was easier to make Unix user-friendly than to fix Windows "It doesn't matter how well-crafted a system is to eliminate errors; Regardless of any and all checks and balances in place, all systems will fail because, somewhere, there is meat in the loop." - me ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 [1] ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ [2] Links: ------ [1] http://www.marist.edu/htbin/wlvindex?LINUX-390 [2] http://wiki.linuxvm.org/ [3] http://www.itconline.com/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
