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feat: Add new tunable --shm-metadata-msg-size

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The shm metadata msg will be right-padded to the given size. This
tunable may be used to saturate the kernel msg buffers more quickly with
the effect that the ZeroMQ message queue size - on which the FairMQ
shmem transport relies upon - behaves more accurately for very small
queue sizes.

This introduces a change for the meta msg format in the multipart case:
old: | MetaHeader 1 | ... | MetaHeader n |
new: | n | MetaHeader 1 | ... | MetaHeader n | padded to fMetadataMsgSize |
where `n` is a `size_t` and contains the number of following meta headers.
Previously, this number was infered from the msg buffer size itself which is
no longer possible due to the potential padding.

Implements #432
This commit is contained in:
Dennis Klein
2023-06-07 22:24:42 +02:00
committed by Dennis Klein
parent 491a943c63
commit f278e7e312
4 changed files with 42 additions and 30 deletions
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2
fairmq/plugins/config/Config.cxx
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@@ -11,6 +11,7 @@
#include <fairmq/JSONParser.h>
#include <fairmq/SuboptParser.h>
#include <cstddef> // for std::size_t
#include <vector>
using namespace std;
@@ -72,6 +73,7 @@ Plugin::ProgOptions ConfigPluginProgramOptions()
("shm-zero-segment", po::value<bool >()->default_value(false), "Shared memory: zero the shared memory segment memory after initialization (opened or created).")
("shm-zero-segment-on-creation", po::value<bool >()->default_value(false), "Shared memory: zero the shared memory segment memory only once when created.")
("shm-throw-bad-alloc", po::value<bool >()->default_value(true), "Shared memory: throw fair::mq::MessageBadAlloc if cannot allocate a message (retry if false).")
("shm-metadata-msg-size", po::value<std::size_t >()->default_value(0), "Shared memory: size of the zmq metadata message (values smaller than minimum are clamped to the minimum).")
("bad-alloc-max-attempts", po::value<int >(), "Maximum number of allocation attempts before throwing fair::mq::MessageBadAlloc. -1 is infinite. There is always at least one attempt, so 0 has safe effect as 1.")
("bad-alloc-attempt-interval", po::value<int >()->default_value(50), "Interval between attempts if cannot allocate a message (in ms).")
("shm-monitor", po::value<bool >()->default_value(false), "Shared memory: run monitor daemon.")