Questions tagged [scheduling]

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How to see contents of output queue of NIC in Linux and introspect frame delay

I am experimenting with tc tool to implement prioritization of specific data coming from my computer and would like to see exatly how the frames are scheduled and how much time they spend in the qdisc ...
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106 views

No Pods reachable or schedulable on kubernetes cluster

I have 2 kubernetes clusters in the IBM cloud, one has 2 Nodes, the other one 4. The one that has 4 Nodes is working properly but at the other one I had to temporarily remove the worker nodes due to ...
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Can kubernetes move pods that begin to have interfering workloads?

Consider that I have two pods: one is serving webpages and another is performing consistent computation, like a Flask server on one pod and a Spark Executor as the other. Suddenly a new feature ...
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1 answer
512 views

WSUS GPO - Specific week specified, but ignored

I have configured a GPO to force updates via GPO in a scheduled maintenance window since these boxes were previously getting updates and just rebooting outside of active hours. I would prefer that ...
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1 answer
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How to schedule VMs in few specific host?

I have 4 nodes, 1 controller nodes and 3 compute node. I divined into 2 AZ, AZ1 (compute1) and AZ2(compute2, compute3) I can use create instance w/ --avaibilty-zone AZ1 (AZ2) to make the instance ...
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1 vote
1 answer
234 views

Finding wasteful or over-provisioned pods on a "full" but underutilized Kubernetes cluster

I work on a Kubernetes cluster where, right now, about 95% of the CPUs and 90% of the memory have been allocated to pods. However, according to the Kubernetes Dashboard, the overall instantaneous CPU ...
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  • 283
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3 answers
2k views

Prevent multiple cron jobs from running concurrently [duplicate]

My server runs a number of cron jobs at midnight. Each job creates a backup of something, by creating a tarball and compressing it with xz. Since xz is a CPU and memory pig, I added a random delay to ...
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3 votes
1 answer
894 views

Debugging and fine-tuning the linux process scheduler

When debugging sporadic web application slowdowns, I've found that all the processes have quite high maximum scheduling delay. # perf sched record -- sleep 10 && perf sched latency --sort max ...
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1 answer
42 views

Can a linux process be configured to run ANY time it is ready?

I have a process that does a small amount of work, then goes to sleep for 1-5ms. When that sleep time is up, I want that process to get the CPU IMMEDIATELY! Whatever process is already on the CPU ...
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2 answers
12k views

User's Free/Busy status not viewable in "Scheduling Assistant" in Outlook client only

This is a weird one, and I've been Googling for days without any luck. I have a client who runs Exchange/Outlook 2016. Jane Doe is in the Marketing department, and her AA (John Smith), and a few ...
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Gentoo running unknown scheduler

I inherited management of a Gentoo based server (Gentoo Base System release 2.3, 4.4.26-gentoo) that is invoking a number of php scripts each night but I can't figure out how. I don't see them ...
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1 answer
1k views

Does ionice has any effect on NFS client?

I need to remove millions of directories recursively on a NFS share and to avoid any performance issues, I ran the command with: ionice -c 3 -t find /dir -type f -exec rm {}; which will delete all ...
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3 answers
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Schedule email forwarding in Office 365

Is it possible to schedule email forwarding start/stop in Office 365? I see a way to enable/disable in both the Office 365 and Exchange sides, but no way to schedule it. Exchange mail flow rules don't ...
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3 answers
1k views

How to prevent a particular CPU core from being used?

Is it possible to prevent a CPU core from being used by the OS in Linux? The maxcpus=<n> boot parameter prevents specified number of cores from being seen in the OS. I want that all cores be ...
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1 answer
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Making Linux processes schedule based on other prcoesses

I am using CentOS release 6.7. I have 2 services, say A and B. Service B is dependent on service service A. For example, if service A stops, I want service B to stop automatically. Similarly, if ...
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  • 153
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1 answer
313 views

tc filters not working with DRR

I am trying to control the outgoing traffic from two VMs with the DRR qdisc. This is the hierarchy I want to have: root | qdisc drr ...
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2 votes
2 answers
2k views

What are front merges in I/O scheduling and how can I tune this parameter?

My Linux uses the Deadline algorithm for I/O scheduling. One of the parameters is the front_merges parameter under /sys/block/sda/queue/iosched/front_merges. By default it is set to 1, which means ...
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Why my task has 0x5 Access denied exit code with Task Scheduler if script was finished?

I have following batch script: copy \\remotehost.ip\c$\dumps\TEST_%date%.dmp C:\dumps\TEST_%date%.dmp sqlplus sys/password as SYSDBA @C:\dumps\recreate_test.sql > C:\dumps\recreate_test.log ...
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1 answer
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Bacula alternative weekly schedule?

How to schedule Job1-Job5 to be run as shown below? Sun Mon Tue Wed Thu --------------------------- Job1 Job2 Sun Mon Tue Wed Thu --------------------------- Job3 Job4 ...
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15 votes
1 answer
15k views

Count number of allowed CPUs in a Docker container

My specific scenario is the following. I launch a docker container with a specific cpuset: docker run --cpuset-cpus="0-2" # ... inside that container I run a shell script as the entry point and that ...
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  • 425
2 votes
0 answers
989 views

cron.weekly runs on wrong day of week on Ubuntu

I have this line in my /etc/crontab: 47 6 * * Sat root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly ) So the cron.weekly should be started every Saturday ...
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  • 477
2 votes
2 answers
69 views

Delayed software release using pre-fetched update data?

I am currently specing out the software requirements for a new project which will be in locations with intermittent network connections. Since some of our locations will have intermittent network ...
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  • 106
0 votes
1 answer
218 views

How can I run a few tasks consecutively that I usually execute manually

Ok, first of all let me describe my working situation so that is is clear why this is a question pertaining to system administration. I work at a larger IT solution company that is running operations ...
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0 answers
99 views

need at jobs identified by name (advanced atd daemon)

Sometimes I'd like to delete or overwrite (or simply cat) an at job. Unfortunately, the at jobs are identified by a sequential number (file in /var/spool/cron/atjobs), which makes those operations ...
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1 vote
3 answers
163 views

Crontab schedule monthly

I would like to schedule my tasks every x months on day 1 starting for example, March. I am unsure if this is the syntax I'm looking for (for repeating the job every 4 months): 0 0 1 3/4 * /path/to/...
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  • 113
0 votes
3 answers
135 views

crons are not working, but scripts are... any idea what is it?

I checked on internet , this might be a common problem, but I dont know how to solve it, all things that they said are not my case... The cron is running, I checked, still, I have no log files (at ...
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0 votes
1 answer
885 views

I/O limits in FreeBSD

I am searching for a method to implement per Jail I/O limits in FreeBSD, as linux have from a long time now. During my research I stumbled upon: http://info.iet.unipi.it/~luigi/geom_sched/ My ...
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2 votes
2 answers
4k views

Can KVM CPU assignment count differ from physical hosts CPU count?

I have read this question. I knew already that I could for example, have a quad core machine with four guests each having two vCPUs. As they don't all be require 100% CPU usage all the time, the ...
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1 vote
1 answer
966 views

open source job/process management/monitoring/control system [closed]

I'm looking for an open source solution for the following: I have jobs that need to run continuously. The jobs are applications or scripts. If they fail, they need to be restarted. If they fail, ...
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12 votes
5 answers
43k views

Why is Windows Task Scheduler trying to launch multiple instances?

We have a number of Windows Scheduled tasks that run on one Server 2008 Webserver (not R2) which is in a cluster. We recently moved from an original webserver Cluster to a new webserver Cluser (...
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  • 175
0 votes
1 answer
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Lightweight distributed job queuing system for independent realtime jobs

We are a small team in a Microsoft-only corporate environment. Our core task involves running a sets of about 100 independent runs of an in-house tool. Each run has one input file and multiple output ...
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  • 251
0 votes
2 answers
468 views

cron time is not correct or cron is running with delay

my cron jobs are executed half an hour later than when they are supposed to. Does cron refer to the system time when it executes its jobs or refers to its own time(if it has one)?
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1 vote
1 answer
309 views

Guideline for `nice` priority number?

I'd like a more systematic way for prioritizing my tasks with nice(1). Obviously 0 is "normal", 19 is "lowest priority" and -19 is "highest priority", but what about all the other numbers? If I have ...
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-1 votes
1 answer
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how to start scheduling tasks

"How to start a different task when other task stops" in windows xp.By using task scheduler it has to happen. either programmetically or through command line.
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2 votes
1 answer
346 views

Intelligent Task Scheduler

Is anyone aware of a tool for creating optimal schedules for tasks? I have numerous servers, running multiple databases, with various scripts that import and transform data to and from each database. ...
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5 votes
2 answers
638 views

Program to manage process workflow across machines?

I have an in-house Perl script that is in great need of refactoring. In the interest of not reinventing the wheel, I'm looking to see if an open-source equivalent to it exists, and I'm having trouble ...
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5 votes
1 answer
142 views

AD: Roll out an MSI application at midnight

Using Windows Server's Active Directory and Group Policy, is there a way to roll out an MSI file at a scheduled time, like midnight?
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  • 153
2 votes
0 answers
836 views

Exchange 2003 to 2010 migration: Can I remove free/busy public folder once all users are moved?

Now that all my mailboxes are on the 2010 server, can I remove the schedule+free/busy public folder? I am having scheduling synchronization issues, and I believe it may be at fault. All clients are ...
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1 vote
1 answer
681 views

What is a "virtual context switch"

IBM's AIX has a "virtual context switch" column in lparstat but neither IBM's redbooks nor google searches will tell me what exactly a virtual context switch is and how its different from a regular ...
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3 votes
2 answers
62k views

Outlook 2010 Calendar - Unable to See Free/Busy Scheduling

I am having an issue where random user cannot see others Free/Busy Scheduling in Outlook Calendar 2010. The set up is pretty simple with one domain. I have been Googling all morning, I am unable to ...
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  • 173
2 votes
1 answer
451 views

Three server processes consume no more than 50% of Dual Core CPU

I have three processes running on Intel Core 2 Duo CPU. From watching output of 'top' and graphs of CPU load (drawn by MRTG, data collection via SNMP) I can see that CPU load is never more than 50%, ...
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2 votes
3 answers
4k views

nice renice and ionice

I've read about nice renice and ionice to control the scheduling priority of running processes. However, I still don't understand when and how are they useful for. For instance doing something like: ...
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1 vote
4 answers
12k views

MYSQL Scheduled backups?

I have mysql installed on my web server, which I am accessing using PHPMyAdmin. My client asked me following: Install PhpBB Setup MYSQL Scheduled backup I have installed PhpBB successfully but hwo ...
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5 votes
3 answers
9k views

What is the difference between renice and chrt commands in Linux?

What is the difference between renice and chrt commands in Linux?
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0 votes
1 answer
88 views

How does WIndows Scheduled Task detect that the scheduled application has not started?

in windows server 2003. Does it assume that if it hasn't returned an error code, it must be running? or is there some kind of start code? Thanks, P
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1 vote
1 answer
267 views

Howto check on arcgisserver if service (published map) is started?

I have an ArcGIS Server from Esri running and I need to check every hour if some published services (maps) are running. WMS and WFS.
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1 answer
120 views

Hardware Status update

I am running vcentre 4.0.0 and the Hardware Status page is showing good information about my hosts but it doesn't appear to automatically update. If I hit the update link it does so but is there a way ...
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  • 352
2 votes
1 answer
6k views

Give pthread_setschedparam() permissions to non-root user (linux)

How can I give a non-root user permission to execute pthread_setschedparam() to set thread priorities? Thank you
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3 votes
3 answers
376 views

SQL Server Job system silently fails

We run numerous scheduled jobs using MS SQL 2005 job scheduler. Over the past few weeks, we've been witnessing that a running job will simply STOP and will not record any history in the Log File ...
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123 votes
11 answers
79k views

Prevent duplicate cron jobs running

I have scheduled a cron job to run every minute but sometimes the script takes more than a minute to finish and I don't want the jobs to start "stacking up" over each other. I guess this is a ...
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