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FairRootGroup / FairMQ

C++ Message Queuing Library and Framework
GNU Lesser General Public License v3.0
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Fix poor performance of the refCount segment #501

Closed rbx closed 9 months ago

rbx commented 9 months ago

Tested with the default ref count region size (100MB) and it can hold ~12M counts.

coderabbitai[bot] commented 9 months ago
Walkthrough ## Walkthrough The FairMQ shared memory transport system has undergone a refactoring process. The memory allocation strategy within the `RefCountPool` has shifted from an `adaptive_pool` to a `node_allocator`. Accompanying this, the `maxFreeBlocks` constant was removed, streamlining memory management. In the `Monitor.cxx`, the `PrintShm` function now provides more detailed memory usage statistics. Changes in `UnmanagedRegion.h` reflect a move to more granular allocation and deallocation functions. Lastly, a script for advanced region examples has been adjusted by disabling a specific argument, which may alter the behavior of the `SAMPLER` component. ## Changes | File(s) | Summary | | --- | --- | | `fairmq/shmem/Common.h`, `fairmq/shmem/Monitor.cxx` | Transitioned from `adaptive_pool` to `node_allocator` in memory management and updated shared memory segment monitoring for better memory usage insights. | | `fairmq/shmem/UnmanagedRegion.h` | Shifted to `allocate_one` and `deallocate_one` for more precise memory operations in reference counting. | | `examples/region/.../fairmq-start-ex-region-advanced.sh.in` | Disabled the `--rc-segment-size 0` argument, potentially changing the `SAMPLER` component's behavior. |

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