sharded.hh: add invoke_on variant for a shard range #2449
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avikivity
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| @@ -35,6 +35,8 @@ | |||
| #include <boost/iterator/counting_iterator.hpp> | |||
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sharded.hh: add invoke_on variant for a shard range
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avikivity
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include/seastar/core/sharded.hh
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| requires std::invocable<Func, Service&, Args...> | ||
| && std::is_same_v<futurize_t<std::invoke_result_t<Func, Service&, internal::sharded_unwrap_t<Args>...>>, future<>> | ||
| future<> | ||
| invoke_on(unsigned begin, unsigned end, smp_submit_to_options options, Func func, Args... args) noexcept; |
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Better: pass a std::ranges::range of shards. Then any subset of the shards can be sent. If you want a contiguous range, use std::views::iota.
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Add a convenient method to invoke a function on a range of shards, to have better support for the cold control path on more complex compute models like shard groups for different tasks. A workload can benefit from such a model if inter-task cooperation is better when grouping from perf and QoS perspectives, for example. Or a computation requires a only a subset of shards due to internal concurrency limits.
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Add a convenient method to invoke a function on a range of shards, to have better support for the cold control path on more complex compute models like shard groups for different tasks. A workload can benefit from such a model if inter-task cooperation is better when grouping from perf and QoS perspectives, for example. Or a computation requires a only a subset of shards due to internal concurrency limits.