OSTEP chapter 10
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:extra {:page 132}}
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:extra {:page 142}}
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2
journals/2023_04_07.md
Normal file
2
journals/2023_04_07.md
Normal file
@ -0,0 +1,2 @@
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- 居然要体测，虽然基本上无所谓就是了
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-
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@ -1,2 +1,2 @@
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-
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-
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-
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@ -427,12 +427,81 @@ file-path:: ../assets/ostep_1680491762166_0.pdf
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hl-color:: green
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id:: 642eeb3a-8803-4c73-84a7-cc48c903f10f
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- proliferation 涌现；增殖
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ls-type:: annotation
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hl-page:: 129
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hl-color:: green
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id:: 642eeb44-cf62-4cf6-81cb-f1f6423cb66d
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- cache coherence
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ls-type:: annotation
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hl-page:: 132
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id:: 642eeb44-cf62-4cf6-81cb-f1f6423cb66d
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hl-color:: green
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- Problems with multiple processors
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- cache coherence: basically, hardware handles this
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hl-page:: 132
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ls-type:: annotation
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id:: 642eecc1-d07d-4e48-bcd5-b84db831b241
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- Synchronization: though locks ensure correctness, performance is harmed
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hl-page:: 132
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ls-type:: annotation
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id:: 642f878b-44c2-4485-ae98-448032b588da
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hl-color:: yellow
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- Cache Affinity: cache may still keep some of the process's state, so this may be faster if the process runs on the same CPU next time, in that there is no need to load state from memory.
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hl-page:: 133
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ls-type:: annotation
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id:: 642f87d0-2e9a-405c-8fa6-689dc492ef52
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hl-color:: yellow
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- Single-Queue Multiprocessor Scheduling(SQMS)
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hl-page:: 134
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id:: 642eecc1-d07d-4e48-bcd5-b84db831b241
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- Simply use the same policy as we do in the single processor condition, and pick maybe more than one best jobs to run.
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- Problem 1: lack of scalability. Since it is a single global queue, there will be a lot of contention on the same lock, thus greatly reducing the performance.
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- Problem 2: cache affinity. If the scheduler simply feed processes to CPU by order, the jobs will bounce around from CPU to CPU. Complex affinity mechanism is needed to try to make it more likely that process will continue to run on the same CPU.
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- Multi-Queue Multiprocessor Scheduling (MQMS).
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hl-page:: 135
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ls-type:: annotation
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- Consists of multiple independent queues following some particular policy. Avoid problems of sharing and synchronization.
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- More scalable: when number of CPUs grows, add more queues.
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- Better cache affinity: jobs in the same queue stay in the same CPU
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- Problem: load imbalance. The jobs in the queue with fewer jobs get more CPU share than those in the queue with more jobs. Or even worse, some CPUs are IDLE. (一核有难，七核围观)
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hl-page:: 136
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ls-type:: annotation
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id:: 642f934e-0f7b-43de-97a1-fc530b229098
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hl-color:: yellow
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- Migration: the obvious solution to load imbalance, is to migrate some jobs from one CPU to another. Sometimes, we need to keep switching jobs, in such case that Q1 has 1 job and Q2 has 2 jobs. You may want to keep moving the third job from one CPU to another, to balance load.
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hl-page:: 137
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ls-type:: annotation
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hl-color:: yellow
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- Work stealing: source queue(low on jobs) occasionally peek at other queues to see whether it is a good idea to move some jobs to help balance load.
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- sinister 危险的, 不吉祥的
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hl-page:: 136
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ls-type:: annotation
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id:: 642f914d-502e-4f9d-8878-cf331e7f3fc3
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hl-color:: green
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- insidious 隐伏的,潜在的,阴险的
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hl-page:: 137
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id:: 642f9458-c07c-4ef3-a1ec-a14e76ea4b2b
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hl-color:: green
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- dissertation 专题论文, 学位论文
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ls-type:: annotation
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hl-page:: 138
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hl-color:: green
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id:: 642f96cb-066e-4ab9-975c-a746e3143062
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- daunting 使人畏缩的；使人气馁的；
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ls-type:: annotation
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hl-page:: 138
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hl-color:: green
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id:: 642f97ac-a4ab-4baf-b039-678c466ea588
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- undertake 承担；从事；负责
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ls-type:: annotation
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hl-page:: 138
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hl-color:: green
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id:: 642f97b5-d203-4998-84f0-21d66f8424b7
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- Linux Multiprocessor Schedulers: 3 different schedulers. CFS and O(1) are MQMS, while BFS is SQMS based on EEVDF.
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hl-page:: 138
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ls-type:: annotation
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id:: 642f981d-af29-4cc1-a9da-b445cb964674
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hl-color:: yellow
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-
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