erlang:apply is faster if number of params is known at compile time #4073
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…preserve such info
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## master #4073 +/- ##
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| @@ -227,7 +227,7 @@ run_hook([Handler | Ls], Acc, Params, Key) -> | |||
| hook_fn_ret() | safely:exception(). | |||
| apply_hook_function(#hook_handler{hook_fn = HookFn, extra = Extra}, | |||
| Acc, Params) -> | |||
| safely:apply(HookFn, [Acc, Params, Extra]). | |||
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It was the only place we've used safely:apply function btw :)
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I know, I could try to get rid of this module but there's an entire test-suite testing properties of this. So now this is scoped to test compilation only.
include/mongoose.hrl
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| @@ -31,6 +31,13 @@ | |||
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| -define(MONGOOSE_URI, <<"https://www.erlang-solutions.com/products/mongooseim.html">>). | |||
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| -define(APPLY_SAFELY(F), | |||
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maybe not mongoose.hrl, could be apply_sefely.hrl...
Also, it is not APPLY_SAFELY(F) anymore, it is catch_v2 :D So, maybe some better name.
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I could happily create such header and simply use the header from both source and test and kill the file.
When it comes to naming, oh naming is hard and it has always been called safely so, dunno :D
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because it was doing erlang:apply(F). Now it does F.
But yea, I would be always think it should be F(), when I would read it. And the arg should be a fun(). So, maybe renaming F is good idea.
Maybe better, idk xdd:
-define(SAFELY(Code), try Code .... end).
or
oh god MATCH_EXCEPTIONS (maybe no) xdd
And put it in safely.hrl so everything is named safely.
NelsonVides
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elasticsearch_and_cassandra_25 / elasticsearch_and_cassandra_mnesia / c47348f small_tests_24 / small_tests / c47348f small_tests_25 / small_tests / c47348f small_tests_25_arm64 / small_tests / c47348f ldap_mnesia_24 / ldap_mnesia / c47348f dynamic_domains_pgsql_mnesia_24 / pgsql_mnesia / c47348f ldap_mnesia_25 / ldap_mnesia / c47348f dynamic_domains_pgsql_mnesia_25 / pgsql_mnesia / c47348f dynamic_domains_mysql_redis_25 / mysql_redis / c47348f pgsql_mnesia_24 / pgsql_mnesia / c47348f dynamic_domains_mssql_mnesia_25 / odbc_mssql_mnesia / c47348f muc_light_http_api_SUITE:end_per_suite{error,
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@NelsonVides please add missing PR descrition - it's not clear what the motivation for this change is. |
I know, Mikhail merged slightly faster than I thought. Writing a description now 🙏🏽 |
Now, description added 🙂 |
According to the erlang's efficiency guide, at https://www.erlang.org/doc/efficiency_guide/functions#function-calls
So giving information to the hook engine about the actual number of parameters, makes the call fall into the second category instead of the fourth. In local micro-benchmarking using benchee, it was around 2% faster.