From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from simark.ca by simark.ca with LMTP id UAX7E+HpkWRzMAkAWB0awg (envelope-from ) for ; Tue, 20 Jun 2023 14:03:13 -0400 Authentication-Results: simark.ca; dkim=pass (2048-bit key; unprotected) header.d=lists.lttng.org header.i=@lists.lttng.org header.a=rsa-sha256 header.s=default header.b=Wp3giYOs; dkim-atps=neutral Received: by simark.ca (Postfix, from userid 112) id 4E08A1E0BB; Tue, 20 Jun 2023 14:03:13 -0400 (EDT) Received: from lists.lttng.org (lists.lttng.org [167.114.26.123]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by simark.ca (Postfix) with ESMTPS id 8B4DD1E0AC for ; Tue, 20 Jun 2023 14:03:10 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=lists.lttng.org; s=default; t=1687284190; bh=gQvwkB36ji2w2X11OSs9bIRPytCeG5901HXHLQiVMoE=; h=Date:To:References:In-Reply-To:Subject:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=Wp3giYOs5Rxuazr1UptDgd5va4Ch5iY7istPQhJE0FK88M04C1JGMZlIiG3+aI2rQ oje8nKwGC/k6gEynFmFOIHFvDyi7aKdT8erSZbobgtCb/8YvOuxU3BLGTdX7KGW/0z +vNR/66FZisUeiYsJTu9umwV08YfVZ6z1dz0Huq2NCEs5F4VnomYQhC62i823A7Fx0 GOtlBDzD4G2hXPbAc2eQVmLncfKTr6an1Of6d43idINSFiO5MAszkxN+/Fuv6Jwus8 jZZxG2NE9jlypXqwrSxuVWkwyyN7p2t2i4PAtH5Uf+vi8A1BSihSld6c9kbl9+SFst QPAd4GMCgow4A== Received: from lists-lttng01.efficios.com (localhost [IPv6:::1]) by lists.lttng.org (Postfix) with ESMTP id 4Qlvct0y98z1yhw; Tue, 20 Jun 2023 14:03:10 -0400 (EDT) Received: from smtpout.efficios.com (smtpout.efficios.com [167.114.26.122]) by lists.lttng.org (Postfix) with ESMTPS id 4Qlvcr2y1tz1yL1 for ; Tue, 20 Jun 2023 14:03:08 -0400 (EDT) Received: from [172.16.0.134] (192-222-143-198.qc.cable.ebox.net [192.222.143.198]) by smtpout.efficios.com (Postfix) with ESMTPSA id 4Qlvcp5RQ5z18jL; Tue, 20 Jun 2023 14:03:06 -0400 (EDT) Message-ID: <900fe19a-5642-9124-4d83-0716e0d11a22@efficios.com> Date: Tue, 20 Jun 2023 14:03:28 -0400 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.12.0 Content-Language: en-US To: "Mousa, Anas" , "lttng-dev@lists.lttng.org" References: <6e06b605ec9f446da5dc8948c8621518@amazon.com> <63288a1f-59b4-80f9-2a26-bc252ce9cd1f@efficios.com> In-Reply-To: <63288a1f-59b4-80f9-2a26-bc252ce9cd1f@efficios.com> Subject: Re: [lttng-dev] Profiling LTTng tracepoint latency on different arm platforms X-BeenThere: lttng-dev@lists.lttng.org X-Mailman-Version: 2.1.39 Precedence: list List-Id: LTTng development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Mathieu Desnoyers via lttng-dev Reply-To: Mathieu Desnoyers Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: lttng-dev-bounces@lists.lttng.org Sender: "lttng-dev" On 6/20/23 10:20, Mathieu Desnoyers via lttng-dev wrote: > On 6/20/23 06:27, Mousa, Anas via lttng-dev wrote: >> Hello, > >> >> Arethereanysuggestionstorootcausethehighlatencyandpotentiallyimproveiton*platform****1*? >> >> Thanks and best regards, >> >> Anas. >> > > I recommend using "perf" when tracing with the sample program in a loop > to figure out the hot spots. With that information on the "fast" and > "slow" system, we might be able to figure out what differs. > > Also, comparing the kernel configurations of the two systems can help. > Also comparing the glibc versions of the two systems would be relevant. > Also make sure you benchmark the lttng "snapshot" mode [1] to make sure you don't run into a situation where the disk/network I/O throughput cannot cope with the generated event throughput, thus causing the ring buffer to discard events. This would therefore "speed up" tracing from the application perspective because discarding an event is faster than writing it to a ring buffer. Thanks, Mathieu [1] https://lttng.org/docs/v2.13/#doc-taking-a-snapshot > Thanks, > > Mathieu > > -- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev