Questions tagged [scheduler]

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Ensure application continues running on server after RDP is disconnected

I have an application that runs on Windows Server 2019 Datacenter. This application is run by a specific user log-on. The user must remain logged in to Windows for the application to continue running. ...
yd132's user avatar
  • 1
0 votes
1 answer
38 views

WebSphere schedulers with lease owner out of scope

I have a WebSphere ND 9.0.5.13 install, running across two nodes. Each node has two servers (JVMs), running two different java applications; both of which use @Schedule annotations. The JVM on Node 1 ...
simonalexander2005's user avatar
0 votes
1 answer
624 views

Can 1 thread running with a 1-cpu quota on an N-core machine use an entire core?

given: A machine with 8 cores a cgroup with 1-CPU quota the cgroup has only 1 process the process is single-threaded How will the CPUs be made available to the process? the process be able to run ...
John Bachir's user avatar
  • 2,364
1 vote
1 answer
2k views

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-...
Serguei Kamchiline's user avatar
0 votes
0 answers
30 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....
Paulius Grigelis's user avatar
-1 votes
1 answer
52 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 = ...
user595016's user avatar
1 vote
1 answer
632 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 ...
PraMiD's user avatar
  • 11
2 votes
1 answer
5k views

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 ...
werner's user avatar
  • 121
2 votes
1 answer
828 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. ...
Levi Uzodike's user avatar
1 vote
0 answers
117 views

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 (...
monkut's user avatar
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0 votes
1 answer
154 views

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 ...
simonszu's user avatar
  • 373
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 ...
Greg's user avatar
  • 1,677
2 votes
0 answers
779 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@...
demonking's user avatar
  • 131
0 votes
2 answers
76 views

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 ...
lubosdz's user avatar
  • 145
1 vote
2 answers
774 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-...
Mikhail Kovtun's user avatar
2 votes
0 answers
2k 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. ...
Vikas Saini's user avatar
2 votes
1 answer
2k 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 ...
GP92's user avatar
  • 741
22 votes
9 answers
71k 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 ...
AnOldSoul's user avatar
  • 429
0 votes
1 answer
163 views

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 * * * * /...
Tamilvanan's user avatar
0 votes
2 answers
44 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. ...
Theraga's user avatar
0 votes
1 answer
248 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 ...
stumped221's user avatar
4 votes
2 answers
9k 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 ...
GP92's user avatar
  • 741
-2 votes
1 answer
77 views

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-...
sba's user avatar
  • 99
1 vote
1 answer
210 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 ...
bad's user avatar
  • 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 ...
Nick's user avatar
  • 852
-1 votes
1 answer
3k views

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:...
Charlie's user avatar
  • 23
2 votes
1 answer
640 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 ...
Jeff's user avatar
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0 votes
1 answer
298 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 ...
pepoluan's user avatar
  • 5,108
10 votes
5 answers
18k 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/...
Ha Son Hai's user avatar
1 vote
1 answer
769 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 ...
Evgeniy Berezovsky's user avatar
0 votes
1 answer
579 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 ...
user229342's user avatar
1 vote
0 answers
199 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 ...
Przemyslaw Wojda's user avatar
12 votes
2 answers
54k 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, ...
kupa's user avatar
  • 381
3 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, ...
Henk's user avatar
  • 59
1 vote
3 answers
4k views

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 ...
José Manuel's user avatar
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+...
eSniff's user avatar
  • 173
3 votes
1 answer
2k views

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 # ...
BraveHeart's user avatar
18 votes
1 answer
14k 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 ...
user79126's user avatar
  • 469
1 vote
2 answers
5k views

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 ...
Nilesh's user avatar
  • 13
0 votes
1 answer
502 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 ...
Sumit's user avatar
  • 121
6 votes
5 answers
6k 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 ...
xioxox's user avatar
  • 609
1 vote
1 answer
2k views

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 ...
Steve Lorimer's user avatar
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 ...
Steve Lorimer's user avatar
4 votes
2 answers
135 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/...
nicoulaj's user avatar
  • 1,205
1 vote
2 answers
3k views

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 <...
User512's user avatar
  • 11
5 votes
1 answer
2k views

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 ...
jhfrontz's user avatar
  • 293
0 votes
1 answer
670 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/...
CDTX's user avatar
  • 1
2 votes
2 answers
13k 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 ...
Bezz's user avatar
  • 31
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 ...
gucki's user avatar
  • 828
0 votes
1 answer
84 views

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? ...
lasse's user avatar
  • 1