how does hpc scheduler work?
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When you have a large cluster and multiple users, each user doesn't know which compute nodes and CPU cores to use, nor how much resources are available on each node. To solve this, cluster batch control systems are used to manage jobs on the system using HPC Schedulers.
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CPU Scheduler or (Short-Term scheduler): Schedules the execution of processes in the ready queue of the system. ... Process Scheduler or (Long-Term scheduler): Selects which processes to be brought to the ready queue of the CPU.
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Message Passing Interface (MPI) is a communication protocol for parallel programming. MPI is specifically used to allow applications to run in parallel across a number of separate computers connected by a network.
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iperf3 is not backwards compatible with iperf2. ... On public test hosts, we recommend that pScheduler should be used to ensure only one iperf test runs at a time. A comparison of throughput measurement tools is available here.
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Round robin algorithm is an algorithm to support time sharing system. This algorithm is similar to the FCFS algorithm but now it is preempted FCFS scheduling. Context switching takes place when one thread is switched to another in that place. ... This is the reason the algorithm is used in modern day computers.
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User-level threads are threads that the OS is not aware of. They exist entirely within a process, and are scheduled to run within that process's timeslices. ... Kernel-level threads are scheduled by the OS, and each thread can be granted its own timeslices by the scheduling algorithm.
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hwclock command in Linux with examples. hwclock also called Real Time Clock (RTC), is a utility for accessing the hardware clock. The hardware clock is independent of the OS(operating system) you use and works even when the machine is shut down. The hardware clock is also called a BIOS clock.
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In VMWare is does not make a difference. It is purely based on how the cpu's are presented to the guest. Whether you choose dual sockets single core each, or single socket with dual core, VMWare treats those as the same, you get 2 cores of CPU time.
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How does KVM work? KVM converts Linux into a type-1 (bare-metal) hypervisor. All hypervisors need some operating system-level components—such as a memory manager, process scheduler, input/output (I/O) stack, device drivers, security manager, a network stack, and more—to run VMs.
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Apache HBase is used to have random, real-time read/write access to Big Data. It hosts very large tables on top of clusters of commodity hardware. Apache HBase is a non-relational database modeled after Google's Bigtable. Bigtable acts up on Google File System, likewise Apache HBase works on top of Hadoop and HDFS.
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['a) Open Network Connections by clicking the Start button, and then clicking Control Panel. ... ', 'b) Right-click the connection that you want to install QoS Packet Scheduler on, and then click Properties. ... ', 'c) Click Install, click Service, and then click Add.', 'd) Click QoS Packet Scheduler and then click OK.']
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Apache Oozie is a Java Web application used to schedule Apache Hadoop jobs. Oozie combines multiple jobs sequentially into one logical unit of work. It is integrated with the Hadoop stack, with YARN as its architectural center, and supports Hadoop jobs for Apache MapReduce, Apache Pig, Apache Hive, and Apache Sqoop.
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If you spawn 20 threads on a single-CPU system, you might see a high load average, even though there are no particular processes that seem to tie up CPU time. The next cause for high load is a system that has run out of available RAM and has started to go into swap.
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vSphere HA provides high availability for virtual machines by pooling the virtual machines and the hosts they reside on into a cluster. Hosts in the cluster are monitored and in the event of a failure, the virtual machines on a failed host are restarted on alternate hosts.
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Fair Scheduler assigns equal amount of resource to all running jobs. When the job completes, free slot is assigned to new job with equal amount of resource. Here, the resource is shared between queues. Capacity Scheduler on the other hand, it assigns resource based on the capacity required by the organisation.
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['Open Network Connections.', 'Click any connection, and then, on the File menu, click Properties.', 'Click Install, click Service, and then click Add.', 'Click QoS Packet Scheduler, and then click OK.']
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Like threads, fibers share address space. However, fibers use cooperative multitasking while threads use preemptive multitasking. Threads often depend on the kernel's thread scheduler to preempt a busy thread and resume another thread; fibers yield themselves to run another fiber while executing.