I am instrumenting an MPI application to output a custom a= pplication trace in CTF using Babeltrace 1.5.2.=C2=A0 I would like to end u= p with a single trace with multiple streams, one per process.=C2=A0 All str= eams share the same stream class (and metadata). All processes have access = to the same file system.=C2=A0 I am using the C CTF writer API using this t= est as an example:

https://github.com/efficios/babe= ltrace/blob/stable-1.5/tests/lib/test_ctf_writer.c

W= hat I have in mind is something like this: process 0 would be responsible f= or writing the metadata and its own stream, while all other processes would= only need to write their own stream.

The issue I have = run into is that the individual stream file names are determined by appendi= ng stream->id to the stream filename and the stream id is determined beh= ind the scenes as=C2=A0stream->id =3D stream_class->next_stream_id++.= =C2=A0 Since each process has its own address space, all processes want str= eam id of 0.

Is there a way using the current API = to explicitly set the stream id so that each process will write to a separa= te file?

I'm also open for suggestions on the = overall approach.=C2=A0 The main reason to have each process as a separate = stream in a single trace is so that I can open the entire trace in an analy= sis tool like TraceCompass and see all processes together.

Rocky

--f403045f286a2c983a054c5df9e4-- --===============2425624148453075805== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbHR0bmctZGV2 IG1haWxpbmcgbGlzdApsdHRuZy1kZXZAbGlzdHMubHR0bmcub3JnCmh0dHBzOi8vbGlzdHMubHR0 bmcub3JnL2NnaS1iaW4vbWFpbG1hbi9saXN0aW5mby9sdHRuZy1kZXYK --===============2425624148453075805==-- From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jonathan Rajotte Julien Subject: Re: Using Babeltrace to write CTF for MPI application Date: Tue, 4 Apr 2017 19:52:47 -0400 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mail.efficios.com (mail.efficios.com [167.114.142.141]) by lists.lttng.org (Postfix) with ESMTPS id 3vyQlY3nBlz5H for ; Tue, 4 Apr 2017 23:53:13 +0000 (UTC) Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.efficios.com (Postfix) with ESMTP id 0528B34020C for ; Tue, 4 Apr 2017 23:53:58 +0000 (UTC) Received: from mail.efficios.com ([127.0.0.1]) by localhost (evm-mail-1.efficios.com [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id Kn51vlCON7vk for ; Tue, 4 Apr 2017 23:53:57 +0000 (UTC) Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.efficios.com (Postfix) with ESMTP id 5B96834022A for ; Tue, 4 Apr 2017 23:53:57 +0000 (UTC) Received: from mail.efficios.com ([127.0.0.1]) by localhost (evm-mail-1.efficios.com [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id zhPEsNJO6UKc for ; Tue, 4 Apr 2017 23:53:57 +0000 (UTC) Received: from [192.168.2.14] (mtrlpq2848w-70-48-16-61.dsl.bell.ca [70.48.16.61]) by mail.efficios.com (Postfix) with ESMTPSA id 4588134020C for ; Tue, 4 Apr 2017 23:53:57 +0000 (UTC) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: lttng-dev-bounces@lists.lttng.org Sender: "lttng-dev" To: lttng-dev@lists.lttng.org List-Id: lttng-dev@lists.lttng.org SGkgUm9ja3ksCgpOb3Qgc3VyZSBpZiBwZXJ0aW5lbnQgYnV0IGRpZCB5b3UgdGFrZSBhIGxvb2sg YXQgdGhlIGJhcmVjdGYgWzFdIHByb2plY3Q/CgpDaGVlcnMKClsxXSBodHRwczovL2dpdGh1Yi5j b20vZWZmaWNpb3MvYmFyZWN0ZgoKT24gMjAxNy0wNC0wNCAwNToyOSBQTSwgUm9ja3kgRHVubGFw IHdyb3RlOgo+IEkgYW0gaW5zdHJ1bWVudGluZyBhbiBNUEkgYXBwbGljYXRpb24gdG8gb3V0cHV0 IGEgY3VzdG9tIGFwcGxpY2F0aW9uIHRyYWNlIGluIENURiB1c2luZyBCYWJlbHRyYWNlIDEuNS4y LiAgSSB3b3VsZCBsaWtlIHRvIGVuZCB1cCB3aXRoIGEgc2luZ2xlIHRyYWNlIHdpdGggbXVsdGlw bGUgc3RyZWFtcywgb25lIHBlciBwcm9jZXNzLiAgQWxsIHN0cmVhbXMgc2hhcmUgdGhlIHNhbWUg c3RyZWFtIGNsYXNzIChhbmQgbWV0YWRhdGEpLiBBbGwgcHJvY2Vzc2VzIGhhdmUgYWNjZXNzIHRv IHRoZSBzYW1lIGZpbGUgc3lzdGVtLiAgSSBhbSB1c2luZyB0aGUgQyBDVEYgd3JpdGVyIEFQSSB1 c2luZyB0aGlzIHRlc3QgYXMgYW4gZXhhbXBsZToKPiBodHRwczovL2dpdGh1Yi5jb20vZWZmaWNp b3MvYmFiZWx0cmFjZS9ibG9iL3N0YWJsZS0xLjUvdGVzdHMvbGliL3Rlc3RfY3RmX3dyaXRlci5j Cj4gCj4gV2hhdCBJIGhhdmUgaW4gbWluZCBpcyBzb21ldGhpbmcgbGlrZSB0aGlzOiBwcm9jZXNz IDAgd291bGQgYmUgcmVzcG9uc2libGUgZm9yIHdyaXRpbmcgdGhlIG1ldGFkYXRhIGFuZCBpdHMg b3duIHN0cmVhbSwgd2hpbGUgYWxsIG90aGVyIHByb2Nlc3NlcyB3b3VsZCBvbmx5IG5lZWQgdG8g d3JpdGUgdGhlaXIgb3duIHN0cmVhbS4KPiAKPiBUaGUgaXNzdWUgSSBoYXZlIHJ1biBpbnRvIGlz IHRoYXQgdGhlIGluZGl2aWR1YWwgc3RyZWFtIGZpbGUgbmFtZXMgYXJlIGRldGVybWluZWQgYnkg YXBwZW5kaW5nIHN0cmVhbS0+aWQgdG8gdGhlIHN0cmVhbSBmaWxlbmFtZSBhbmQgdGhlIHN0cmVh bSBpZCBpcyBkZXRlcm1pbmVkIGJlaGluZCB0aGUgc2NlbmVzIGFzIHN0cmVhbS0+aWQgPSBzdHJl YW1fY2xhc3MtPm5leHRfc3RyZWFtX2lkKysuICBTaW5jZSBlYWNoIHByb2Nlc3MgaGFzIGl0cyBv d24gYWRkcmVzcyBzcGFjZSwgYWxsIHByb2Nlc3NlcyB3YW50IHN0cmVhbSBpZCBvZiAwLgo+IAo+ IElzIHRoZXJlIGEgd2F5IHVzaW5nIHRoZSBjdXJyZW50IEFQSSB0byBleHBsaWNpdGx5IHNldCB0 aGUgc3RyZWFtIGlkIHNvIHRoYXQgZWFjaCBwcm9jZXNzIHdpbGwgd3JpdGUgdG8gYSBzZXBhcmF0 ZSBmaWxlPwo+IAo+IEknbSBhbHNvIG9wZW4gZm9yIHN1Z2dlc3Rpb25zIG9uIHRoZSBvdmVyYWxs IGFwcHJvYWNoLiAgVGhlIG1haW4gcmVhc29uIHRvIGhhdmUgZWFjaCBwcm9jZXNzIGFzIGEgc2Vw YXJhdGUgc3RyZWFtIGluIGEgc2luZ2xlIHRyYWNlIGlzIHNvIHRoYXQgSSBjYW4gb3BlbiB0aGUg ZW50aXJlIHRyYWNlIGluIGFuIGFuYWx5c2lzIHRvb2wgbGlrZSBUcmFjZUNvbXBhc3MgYW5kIHNl ZSBhbGwgcHJvY2Vzc2VzIHRvZ2V0aGVyLgo+IAo+IFJvY2t5Cj4gCj4gCj4gX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KPiBsdHRuZy1kZXYgbWFpbGluZyBs aXN0Cj4gbHR0bmctZGV2QGxpc3RzLmx0dG5nLm9yZwo+IGh0dHBzOi8vbGlzdHMubHR0bmcub3Jn L2NnaS1iaW4vbWFpbG1hbi9saXN0aW5mby9sdHRuZy1kZXYKPiAKCi0tIApKb25hdGhhbiBSLiBK dWxpZW4KRWZmaWNpb3MKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX18KbHR0bmctZGV2IG1haWxpbmcgbGlzdApsdHRuZy1kZXZAbGlzdHMubHR0bmcub3JnCmh0 dHBzOi8vbGlzdHMubHR0bmcub3JnL2NnaS1iaW4vbWFpbG1hbi9saXN0aW5mby9sdHRuZy1kZXYK