Hi Deepak, By closure I meant grpc_closure <https://github.com/grpc/grpc/blob/4ea19235d72404c9fb56fcf155f7fbf8ea8ec37e/src/core/lib/iomgr/closure.h#L73> i.e the callback functions which contain most of the logic inside grpc core.
thanks, Sree On Wed, Aug 9, 2017 at 5:23 PM, Deepak Ojha <deepakojha....@gmail.com> wrote: > Thanks Sree! > > Just to confirm by closure, you mean shutting down idle connections? > > Regards, > Deepak > > On Tue, Aug 8, 2017 at 8:14 PM, Sree Kuchibhotla <sr...@google.com> wrote: > >> Hi Deepak, >> grpc core internally creates two sets of thread pools : >> - Timer thread pool >> <https://github.com/grpc/grpc/blob/master/src/core/lib/iomgr/timer_manager.c> >> (to execute timers/alarms): Max of 2 threads. Typically just one. >> - Executor thread pool >> <https://github.com/grpc/grpc/blob/master/src/core/lib/iomgr/executor.c#L81>: >> A dedicated thread pool (with max threads of 2*number of cores on your >> machine) that handle executing closures.= >> >> So this is what you are perhaps seeing. Currently we have not exposed a >> way to configure these thread pool sizes but we might add it in future. >> >> thanks, >> -Sree >> >> >> On Thursday, August 3, 2017 at 3:32:28 PM UTC-7, deepako...@gmail.com >> wrote: >>> >>> Hi, >>> >>> I am planning to implement a service that has very low scale i.e. it >>> would service only a handful of clients. >>> I want to keep resource usage to minimal and thus trying to use a single >>> thread for all clients. After reading >>> gRPC documentation it seems async model is the way to go. But when I >>> tried greeter_async_server example >>> in cpp, I see it creates multiple threads(18 in my case) although it >>> uses a single thread to service all clients(which I want) >>> . >>> Is there a way to avoid creation of so many threads in async model? >>> >>> bash-4.2$ ps -ax | grep async >>> 1425 pts/5 Sl+ 0:27 ./greeter_async_server >>> >>> top - 15:15:02 up 153 days, 1:17, 13 users, load average: 0.00, 0.00, >>> 0.04 >>> Threads: 18 total, 0 running, 18 sleeping, 0 stopped, 0 zombie >>> %Cpu(s): 0.0 us, 0.0 sy, 0.0 ni, 99.9 id, 0.0 wa, 0.0 hi, 0.0 si, >>> 0.0 st >>> KiB Mem : 49457112 total, 45066340 free, 3105740 <310-5740> used, >>> 1285032 buff/cache >>> KiB Swap: 2097148 total, 2095108 free, 2040 used. 45603564 avail >>> Mem >>> >>> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ >>> COMMAND >>> 1425 deojha 20 0 244532 7716 5164 S 0.0 0.0 0:00.00 >>> greeter_async_s >>> 1426 deojha 20 0 244532 7716 5164 S 0.0 0.0 0:12.08 >>> greeter_async_s >>> 1428 deojha 20 0 244532 7716 5164 S 0.0 0.0 0:01.04 >>> greeter_async_s >>> 1429 deojha 20 0 244532 7716 5164 S 0.0 0.0 0:00.81 >>> greeter_async_s >>> 1430 deojha 20 0 244532 7716 5164 S 0.0 0.0 0:00.99 >>> greeter_async_s >>> 1431 deojha 20 0 244532 7716 5164 S 0.0 0.0 0:01.09 >>> greeter_async_s >>> 1432 deojha 20 0 244532 7716 5164 S 0.0 0.0 0:00.77 >>> greeter_async_s >>> 1433 deojha 20 0 244532 7716 5164 S 0.0 0.0 0:01.02 >>> greeter_async_s >>> 1434 deojha 20 0 244532 7716 5164 S 0.0 0.0 0:00.99 >>> greeter_async_s >>> 1435 deojha 20 0 244532 7716 5164 S 0.0 0.0 0:01.08 >>> greeter_async_s >>> 1436 deojha 20 0 244532 7716 5164 S 0.0 0.0 0:00.83 >>> greeter_async_s >>> 1437 deojha 20 0 244532 7716 5164 S 0.0 0.0 0:01.06 >>> greeter_async_s >>> 1438 deojha 20 0 244532 7716 5164 S 0.0 0.0 0:00.91 >>> greeter_async_s >>> 1439 deojha 20 0 244532 7716 5164 S 0.0 0.0 0:00.79 >>> greeter_async_s >>> 1440 deojha 20 0 244532 7716 5164 S 0.0 0.0 0:01.06 >>> greeter_async_s >>> 1444 deojha 20 0 244532 7716 5164 S 0.0 0.0 0:00.83 >>> greeter_async_s >>> 1445 deojha 20 0 244532 7716 5164 S 0.0 0.0 0:00.75 >>> greeter_async_s >>> 1446 deojha 20 0 244532 7716 5164 S 0.0 0.0 0:00.76 >>> greeter_async_s >>> >>> >>> Uses single thread to service all clients. >>> >>> top - 15:15:42 up 153 days, 1:18, 13 users, load average: 0.22, 0.05, >>> 0.05 >>> Threads: 18 total, 0 running, 18 sleeping, 0 stopped, 0 zombie >>> %Cpu(s): 6.3 us, 7.5 sy, 0.0 ni, 85.7 id, 0.0 wa, 0.0 hi, 0.5 si, >>> 0.0 st >>> KiB Mem : 49457112 total, 45056008 free, 3110176 used, 1290928 >>> buff/cache >>> KiB Swap: 2097148 total, 2095108 free, 2040 used. 45593760 avail >>> Mem >>> >>> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ >>> COMMAND >>> 1425 deojha 20 0 244640 8308 5548 S 19.6 0.0 0:02.21 >>> greeter_async_s >>> 1426 deojha 20 0 244640 8308 5548 S 0.0 0.0 0:12.09 >>> greeter_async_s >>> 1428 deojha 20 0 244640 8308 5548 S 0.0 0.0 0:01.04 >>> greeter_async_s >>> 1429 deojha 20 0 244640 8308 5548 S 0.0 0.0 0:00.81 >>> greeter_async_s >>> 1430 deojha 20 0 244640 8308 5548 S 0.0 0.0 0:00.99 >>> greeter_async_s >>> 1431 deojha 20 0 244640 8308 5548 S 0.0 0.0 0:01.09 >>> greeter_async_s >>> 1432 deojha 20 0 244640 8308 5548 S 0.0 0.0 0:00.77 >>> greeter_async_s >>> 1433 deojha 20 0 244640 8308 5548 S 0.0 0.0 0:01.02 >>> greeter_async_s >>> 1434 deojha 20 0 244640 8308 5548 S 0.0 0.0 0:00.99 >>> greeter_async_s >>> 1435 deojha 20 0 244640 8308 5548 S 0.0 0.0 0:01.08 >>> greeter_async_s >>> 1436 deojha 20 0 244640 8308 5548 S 0.0 0.0 0:00.83 >>> greeter_async_s >>> 1437 deojha 20 0 244640 8308 5548 S 0.0 0.0 0:01.06 >>> greeter_async_s >>> 1438 deojha 20 0 244640 8308 5548 S 0.0 0.0 0:00.91 >>> greeter_async_s >>> 1439 deojha 20 0 244640 8308 5548 S 0.0 0.0 0:00.79 >>> greeter_async_s >>> 1440 deojha 20 0 244640 8308 5548 S 0.0 0.0 0:01.06 >>> greeter_async_s >>> 1444 deojha 20 0 244640 8308 5548 S 0.0 0.0 0:00.83 >>> greeter_async_s >>> 1445 deojha 20 0 244640 8308 5548 S 0.0 0.0 0:00.75 >>> greeter_async_s >>> 1446 deojha 20 0 244640 8308 5548 S 0.0 0.0 0:00.76 >>> greeter_async_s >>> >>> Regards, >>> Deepak >>> >> > > > -- > Thanks & Regards > > Deepak Ojha > -- You received this message because you are subscribed to the Google Groups "grpc.io" group. 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