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PGConf India 2020 - Lightning Talk - Synchronization Mechanisms - Rahila S - 2ndQuadrant

Rahila Syed
Performance Engineer at 2ndQuadrant
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PGConf India, 2020
February 26, 2020, Bengaluru, India
PGConf India, 2020
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Rahila Syed
Performance Engineer at 2ndQuadrant

I develop features and bug fixes for PostgreSQL-An open source ORDBMS. I take a keen interest in resolving customer queries regarding database and its performance.

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So hi everyone. I'm going to give some information about synchronisation mechanisms in postgresql. So illegal episode Melanson has given a detailed talk on the rocks in postgresql which covers like everything. What I am trying to tell you your is the internal mechanisms like in postgresql, what are the synchronization mechanisms be used? Because supposed to pay scale as all of, you know, isn't like a mighty process systems of for multiple processes to computation. So

Spell Ox. So these are the most lightweight locks. I don't want to confuse you because there's something else as well. But this is a these are thick of a very less time to execute. When you are going to take a lock it won't take a lot of time to take this lock. It is an exclusive lock that that means at a time. Only one process can occupy this log into the computation spy. The others have to wait. It is why the processes wait at they have to wait in a busy Loop

that consumed CPU so it's not advisable that should be taken. Care of Performing, very, heavy operation was like going to call us pics of protein Source accessories or anything, so that's not advisable. It does not provide any monitoring because from opposites talk as well. That we have monitoring a facility available for the locks. But it's as I have instructions and soda and detection also does not automatically detect a deadlock in this case. A yeah,

So these are the apis you use to clear. Take a screen lock has been lookin. It is the basic you don't use any memory without any for that. Aspillaga quietest increase the value of the variable by 1. So that shows that you have acquired. The log spinlock releases just release it by decreasing. It is to just check if the lock is free or being occupied that you don't have to retake the local. This is not child in the sense of these can be used for scientific operations and

media access of usually do using a box. So that all you have to do some competition that involves to shave memory of first-place processes. Take a few locks so I can be taken into most exclusive and shared lock mode so I can take this lock and do the computation. So yes, lock manager, releases takes care of releasing the lock up on it so you don't have to you can actually headed out while holding the lock. Okay, okay, then I was just as fast and this is the difference between the Hawks and the

this is somewhat unusual encounter. This actually recording panel, index can and that came across a situation where computation was divided into two phases. Phase 1, Phase 2 and phase one of princes are they were like a number of processes of processing. The phase one. Okay. I think I shall have to hang in there but I was just like, to control this what I'm saying? After all the process of processing, head of finish, the processing. So this was a unique condition of that. A condition variables are basically

something that all the processes can wait for a certain condition to be fulfilled before. The computation is okay, thank you.

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