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• W3130341238 abstract "Many-to-many mapping models for user- to kernel-level threads (or M:N threads) have been extensively studied for decades as a lightweight substitute for current Pthreads implementations that provide a simple one-to-one mapping (1:1 threads). M:N threads derive performance from their ability to allow users to context switch between threads and control their scheduling entirely in user space with no kernel involvement. This same ability, however, causes M:N threads to lose the kernel-provided ability of implicit OS preemption---threads have to explicitly yield control for other threads to be scheduled. Hence, programs over nonpreemptive M:N threads can cause core starvation, loss of prioritization, and, sometimes, deadlock unless programs are written to explicitly yield in proper places. This paper explores two techniques for M:N threads to efficiently achieve implicit preemption similar to 1:1 threads: signal-yield and KLT-switching. Overheads of these techniques, with our optimizations, can be less than 1% compared with nonpreemptive M:N threads. Our evaluation with three applications demonstrates that our preemption techniques for M:N threads improve core utilization and enhance the performance by utilizing lightweight context switching and flexible scheduling of M:N threads." @default.
• W3130341238 created "2021-03-01" @default.
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• W3130341238 date "2021-02-17" @default.
• W3130341238 modified "2023-09-30" @default.
• W3130341238 title "Lightweight preemptive user-level threads" @default.
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• W3130341238 doi "https://doi.org/10.1145/3437801.3441610" @default.
• W3130341238 hasPublicationYear "2021" @default.
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