Questions tagged [scheduler]

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How to apply new default kube-scheduler config?

Kubernetes version 1.22. Cluster created by kops. I'm trying to alternate default kube-scheduler config (adding profiles) as descibed here https://kubernetes.io/docs/reference/config-api/kube-...
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19 views

cloud scheduler does not start for an hour on 'Daylight Saving Time Ended' event, when US rolls back clocks for 1 hour

So, we have an issue that we have some active schedulers that run every 4mins or so. And they get stuck for an hour or even more when US rolls back clocks for 1 hour. This happened a 3rd year in a row....
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-1 votes
1 answer
47 views

php core script not getting called from Crontab

I am using core PHP and written a simple script that needs to be called automatically. For testing purpose I have just written a print statement as below, $host = 'localhost'; $user = 'admin'; $pass = ...
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0 votes
1 answer
328 views

Low performance on file copy operations due large idle times (rsync, cp, ..)

I'm currently copying large directory tree from an external HDD to to internal storage of my server. The performance of the copy operation is basically quite good, i.e. 35MB/s with the external HDD ...
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1 answer
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How to list all Schedulers in a Kubernetes cluster?

How can I get a list of all schedulers in a Kubernetes cluster, if I do not want to rely on the pod names? The command kubectl get pods --all-namespaces | grep scheduler would miss a scheduler ...
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  • 101
2 votes
1 answer
612 views

In CentOS 7, is there a way to specify which block devices should be tuned with the scheduler (or ELEVATOR)?

In CentOS 6, there was /etc/tune-profiles/my-server/ktune.sysconfig with this text(I'm referring to the comments that explain what the code is doing): # This is the I/O scheduler ktune will use. ...
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1 vote
0 answers
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Child application doesn't start when run from windows scheduled task

I'm trying to schedule an automation script. The 1. .bat file starts monitor script (python) 2. monitor script (python) does network request for jobs from other system 3. if job, monitor script (...
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  • 255
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1 answer
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OpenShift Spanning Cluster: Distribute Replicas evenly between datacenters

I have an OpenShift Cluster which is spanned between two physical separated datacenters for georedundancy. The nodes are labeled according to their location. Now i'm searching for a way to configure ...
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  • 343
2 votes
1 answer
2k views

rcu_sched self-detected stall on CPU + watchdog: BUG: soft lockup - CPU#3 stuck for 22s

Being unable to ssh into a machine I connected it to a monitor and found the following: The machine is running Ubuntu Server 18.04 LTS and is a first generation 8 core Ryzen 1700. I've restarted the ...
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2 votes
0 answers
637 views

Is it possible to set an IO scheduler in KVM Guest with VirtIO?

Is it possible to set an IO scheduler in a KVM Guest with VirtIO? With the following command i don't get any options to choose cat /sys/block/vda/queue/schedule none Kerneloption are set: root@...
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  • 131
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2 answers
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CRON - execute on days 1-5 during weeks 25 - 36

Is there any way to schedule execution of CRON: only during weeks 25 - 36 during the year and only on Mon - Frid (not weekends) This is because of summer holidays when people place a lot of orders ...
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  • 145
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2 answers
491 views

Linux: scheduling processes and threads

When there are multiple single-threaded processes and some multi-threaded processes, all CPU-intensive, how time is divided between them (assuming that all have the same priority)? For example, on 48-...
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2 votes
0 answers
1k views

How to change I/O scheduler for a disk in ubuntu 16.04?

I am trying to set noop I/O scheduler for my disk. However, I am getting this error, -bash: echo: write error: Invalid argument I checked and found that there is no I/O scheduler option in my disk. ...
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1 vote
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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  • 589
17 votes
8 answers
54k views

Task scheduler scheduled task at startup not working

I have scheduled a task to be run at system startup. But its not working. When I run the task manually, it is working. Below are the screenshots of the settings. What have I done wrong here? This ...
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  • 379
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1 answer
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Multiple crons at same interval fails - linux crontab

In my server, I have scheduled following set of cron files. 00 21 * * * /bin/sh /path/db_backup.sh */2 * * * * /usr/bin/php /path/file1.php */2 * * * * /usr/bin/php /path/file2.php ... */2 * * * * /...
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2 answers
38 views

Job scheduler with target list

I want to have a scheduler that can run a command on a list of targets using a cluster of nodes. So, for example I want to run Nmap on a list of IP's. These IP's can be in a CSV, JSON, database etc. ...
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1 answer
198 views

Use deadline I/O Scheduler on BusyBox v1.16.1

Does anyone know how to add / make available the deadline I/O schedulers on BusyBox v1.16.1 ? The only two I see when I run "cat/sys/block/sda/queue/scheduler" is as follows: [noop] cfq My ...
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4 votes
2 answers
7k views

What is the difference between h_rss and h_vmem in Sun Grid Engine (SGE)?

So far as I understood, mem_free can be specified to submit a job in a host that has the memory free = mem_free, whereas h_vmem is the hard limit of the memory up to which the job can consume and ...
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-2 votes
1 answer
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Scheduler to switch things on/off based on weekday, date and time of day [closed]

I'm looking for a Linux program that can give me an on/off answer based on time. I'm thinking of something that can read simple rules like these mon-wed 18:30-21:15 thu 17:30-21:15 fri 14:00-...
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  • 99
1 vote
1 answer
188 views

Where can I find the otrs-scheduler file?

Im trying to install otrs on a Debian system. I followed these instructions. It works well til the last step. But I can simply not find the file scripts/otrs-scheduler-linux which is referenced in the ...
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  • 11
1 vote
1 answer
2k views

Why my disk elevator is set to "deadline"

I have CentOS 6.x Linux server with kernel 2.6.32-573.8.1.el6.x86_64. I did some checks today and I found that disk elevator is "deadline". [root@srv ~]# cat /sys/block/sda/queue/scheduler noop ...
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  • 776
-1 votes
1 answer
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Run Windows Task Scheduler through Web Interface [closed]

Is it possible to run (on demand), not schedule, a simple task that has already been scheduled under Windows Task Scheduler, through a web interface? Any suggestions are appreciated. Thank you Info:...
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2 votes
1 answer
526 views

Powershell: PSScheduledJob for non-admin

Is there a way for non-admins to use the PSScheduledJob module? For example, I tried Register-ScheduledJob without admin privilege, but it returns "Access is Denied" error. We know that we can allow ...
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  • 61
0 votes
1 answer
224 views

PHP-FPM on Linux, SCHED_BATCH or SCHED_OTHER?

I have a Linux webserver (Ubuntu 12.04, kernel 3.2.0) running Magento with quite a number of PHP-FPM child processes. Since Magento is a heavy framework, I often see several child processes to baloon ...
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9 votes
5 answers
16k views

What does it mean when Linux has no I/O scheduler

I have some virtual machines running Ubuntu cloud-based image 14.04-1 LTS version. I wanted to see the IO performance of different IO schedulers on the VM so I went to /sys/block/<drive>/queue/...
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1 vote
1 answer
723 views

How are threads distributed among cores in a multi-processor system?

I'm currently checking out the limits of a server application on a system with two 12-core processors, i.e. 24 cores. (Hyper-threading currently disabled). I'm running 12 UDP receive-heavy instances ...
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0 votes
1 answer
393 views

Unable to schedule task to copy across network

I remote access into a server running windows 2008 with my login from active directory. I wrote a BAT file to copy from a different sharefolder to backup files to this server. Running the BAT file ...
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1 vote
0 answers
161 views

Win Srv 2012 task scheduler - trigger based on domain workstation logon/logoff/sleep/wake

I've got a domain controller (only one) with Win Srv 2012 and a number of workstations with Win 7. I need to run a task on a DC straight after domain user logon/off/sleep/wake to a workstation. The ...
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12 votes
2 answers
49k views

Cronjob run every two weeks, on Saturday, starting on this saturday

Today is Friday, October 3, 2014 3:58 AM I want to schedule a cronjob like that to run it at the following dates: Saturday, October 4, 2014 8:00 AM Saturday, October 18, 2014 8:00 AM Saturday, ...
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  • 381
2 votes
2 answers
3k views

How do I configure LXC to allow the use of SCHED_RR in a container?

Any ideas on how I can configure LXC/cgroups, to allow the use of SCHED_RR for applications in a container? On the internet I have seen mention of unmounting the cpu-cgroup, I have tried that, ...
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  • 49
1 vote
3 answers
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Slurm, limit the number of jobs per partition

I am configuring a Slurm scheduler, and I need limit the number of maximum jobs running concurrently on a partition (queue). I am reading a lot of information about accounting and resources, but is ...
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7 votes
1 answer
2k views

Does CoreOS have a cluster aware job scheduler?

Ive been checking out CoreOS and I'm impressed. Before I found CoreOS I was looking at the Mesos/Marathon/Chronos stack as a "cluster kernel". Given the following comparison: init.d == Mesos+...
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  • 173
3 votes
1 answer
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Setting I/O scheduler for SSD based RAID array on EC2 instances

I created a RAID array using the 2 local SSD drives on a EC2 c3.4xlarge instance. # mdadm --create /dev/md127 --level=0 --raid-devices=2 /dev/xvdf /dev/xvdg # mkfs.ext4 /dev/md127 # mkdir /data # ...
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16 votes
1 answer
12k views

Taskset not working over a range of cores in isolcpus

To preface I'm using Debian Wheezy with kernel 3.2 on an AMD64 chipset. My machine has two Xeon E5-2690 cores. I set up the boot parameters so that all the cores on one CPU are dedicated to a single ...
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  • 429
1 vote
2 answers
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How to change the scheduler of a RAID 5 device?

I've created a RAID 5 device block by combining 4 HDDs. The name of my device is md1. But the /sys/block/md1/queue/scheduler file outputs "none" on doing cat. And also after editing it using vim ...
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  • 13
0 votes
1 answer
408 views

Finding context switches count and run queue wait time for a process

I am observing (based on logs) that my (java) process pauses for something during execution. My first guess is a context switch. In order to verify I am trying to find (a) the number of involuntary ...
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  • 121
6 votes
5 answers
5k views

Nice level not working on linux

I have some highly floating point intensive processes doing very little I/O. One is called "xspec", which calculates a numerical model and returns a floating point result back to a master process ...
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  • 529
1 vote
1 answer
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cpusets not working - threads aren't running in the cpuset I specified?

I have used cpuset to shield some cpus for exclusive use by some realtime threads. Displaying the cpuset config with the test app RealtimeTest1 running and its tasks moved into the cpusets: $ cset ...
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1 vote
1 answer
1k views

sched_setaffinity fails after I've used cset shield

I am using cset shield to create a user shield with a set of cpus cset shield --cpu 1,3,5,7 --kthread on The idea behind this is to reserve these cpus for my application code, and push all other ...
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4 votes
2 answers
127 views

Are there cluster resource schedulers abstraction layers?

I'm writing an application that could potentially be run on any cluster resource scheduler (SGE, LSF or SLURM to name a few of them), using very basic functionalities. I'm wondering if a framework/...
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1 vote
2 answers
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Linux Scheduler (not using all cores on multi-core machine) RHEL6

I'm seeing strange behavior on one of my servers (running RHEL 6). There seems to be something wrong with the scheduler. Here's the test program I'm using: #include <stdio.h> #include <...
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5 votes
1 answer
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How do I test the effect of ionice (against a device using the cfq scheduler)?

I'm trying to construct an experiment to measure the effect of ionice. What I'd like to do is to (per another answer on serverfault) cause frequent enough I/O that a sufficiently "niced" process is ...
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  • 263
0 votes
1 answer
665 views

Windows XP Scheduler - Error Adding Another Task (data area passed to a system call is too small)

I'm getting an error "data area passed to a system call is too small" when trying to add a task to the Windows Scheduler. We currently have about 20 tasks in it. Googling the issue, we found to stop/...
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2 votes
2 answers
11k views

How to schedule a job to run every 10 minutes in TWS

TWS is Tivoli Workload Scheduler. I have scheduled a job, and made it repeatable every 10 minutes. I put it in a job stream with a run cycle of daily. Now, the job runs once every ten minutes on the ...
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4 votes
2 answers
5k views

How to properly set CPU Units for OpenVz VEs

According to all the sources I read (openvz wiki, various mailinglists, forums, ..) the values of the cpuunits settings are relative to each other. So when all are equal and the system is busy, all ...
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  • 778
0 votes
1 answer
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cron ++ for Windows

I would like to setup job scheduling on my Windows 7 machine that kicks of jobs and create alarms when they fail. Ideally so that I can run jobs on remote agents. Autosys, visualcron, powershell? ...
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10 votes
3 answers
4k views

Renice: How to change all threads?

When I renice a multithreaded process in Ubuntu 10.04, then view the results in top, it seems that only the main thread actually gets reniced. All the other threads retain their old nice value. What'...
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  • 661
2 votes
2 answers
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How to configure Linux for using only one CPU/core of a NUMA system

I'm currently working with an AMD Opteron-based NUMA system. For the needs of my current project, I'd like to make Linux and all of the system processes to utilize only the CPU0 (and preferably, only ...
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7 votes
2 answers
2k views

Can enabling a RAID controller's writeback cache harm overall performance?

I have an 8 drive RAID 10 setup connected to an Adaptec 5805Z, running Centos 5.5 and deadline scheduler. A basic dd read test shows 400mb/sec, and a basic dd write test shows about the same. When I ...
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