otp development update

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OTP Development update

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EUC 05 presentation 2005-11-022

Highlights during 2005

Released R10B-2 .. R10B-8, will be a R10B-9 before end of year.


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News in R10B-8

Improvements of global new application SSH (both server and client) beta

status, nice way to implement CLI for an application. Debugger now with support for try catch New version of Edoc (thanks to Richard Carlsson)


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Multiprocessor support

The Erlang runtime system of today (R10B)

1 OS process, 1 thread runs all Erlang processes. Can not make use of more than 1 processor for the

execution of Erlang processes.


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Scheduler

select/poll

runqueue

File io threads

Erlang runtime system R10B (1 scheduler)

Pick next runnable


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The Erlang runtime system of tomorrow:

1 OS process, configurable 1..n schedulers in separate threads runs all Erlang processes.

Can make use of multiple processors for the execution of Erlang processes.

Transparent for the Erlang programs. I.e. benefit from multi cpu system without need to change your Erlang code.


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select/poll

runqueue

File io threads

1..nSchedulers

Timerthread

Io thread

Pick next runnable

Erlang runtime system R11B (n schedulers)


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Multiprocessor supportsome additional characteristics

Linux, Solaris (MacOS x) first, (posix threads) No changes in compiler Support “traditional” separate heap per E-process first Hybrid heap later.


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Current status and benchmarks Can run quite a lot of the regular test suites A small benchmark ran:dom([1500,15000]) (2

processes sorting lists) on a 2-cpu machine maskin) give the following result:


Time Relation

Pre 11B without smp support 750 ms base for comparision

Pre 11B with smp and 1 scheduler 845 ms 13% slower

Pre 11B with smp and 2 schedulers 520 ms 31% faster


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Multiprocessor supportway forward

First step (ongoing) Add locking wherever needed Make system stable (Linux, Solaris, MacOSx) with

multiple schedulers on multiple and single cpu systems. Include in R11B (as beta status)

Next step Benchmarking, profiling and optimizations Other platforms (Windows) Include in update release for R11B (end of 2006)


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Multiprocessor supportjoint development

The SMP support for Erlang is a joint development effort between the Ericsson OTP team, Uppsala

University and Synapse

Many thanks to Mikael Pettersson, Uppsala University Tony Rogvall, Synapse


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otp development update

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