Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1tzJxa-000lTL-UW for pgsql-general@arkaria.postgresql.org; Mon, 31 Mar 2025 18:34:11 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.94.2) (envelope-from ) id 1tzJxZ-00AKxX-5K for pgsql-general@arkaria.postgresql.org; Mon, 31 Mar 2025 18:34:09 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1tzJxY-00AKw2-By for pgsql-general@lists.postgresql.org; Mon, 31 Mar 2025 18:34:08 +0000 Received: from fhigh-b4-smtp.messagingengine.com ([202.12.124.155]) by magus.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1tzJxV-002HDh-23 for pgsql-general@lists.postgresql.org; Mon, 31 Mar 2025 18:34:08 +0000 Received: from phl-compute-11.internal (phl-compute-11.phl.internal [10.202.2.51]) by mailfhigh.stl.internal (Postfix) with ESMTP id 195ED25401EF; Mon, 31 Mar 2025 14:34:03 -0400 (EDT) Received: from phl-mailfrontend-01 ([10.202.2.162]) by phl-compute-11.internal (MEProxy); Mon, 31 Mar 2025 14:34:03 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=aklaver.com; h= cc:cc:content-transfer-encoding:content-type:content-type:date :date:from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:subject:subject:to:to; s=fm1; t=1743446042; x=1743532442; bh=6aRkE5nrMsSEVd/gYaRz+5krTf0wiua4UhjL2y50AXM=; b= cLzoMMoeBp/DHOVic2U8WAUdhO7Z0eXDIvG0KD69x6GCEiXnhk3YIxBjj2N4rdtT uJghBMiL62MxNQUkWljXMc3Z45NHbIy185zMpRdHcrUJf3lVI5UnXsoNgFnlv3u6 vlTeWpjPN6bWsAs5VkSJkvXxLIGu1vbLzU5sHg4VYNissBhMyqVgNPOYOQASwNXX 86lCXpYR4b9Ay8k6H0gMXV/5XUW72AqGN2rJpSZOOlSztWukMvgNWgRzVCAx+30i nueOlmRR2aV8XGDXpmmdaJwgNicEMh8NEgNkvcQG72/1H4ner/57BkyaZag6/v9N /2LG1IuY8YlCxcPPN1kAWQ== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding :content-type:content-type:date:date:feedback-id:feedback-id :from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:subject:subject:to:to:x-me-proxy :x-me-sender:x-me-sender:x-sasl-enc; s=fm2; t=1743446042; x= 1743532442; bh=6aRkE5nrMsSEVd/gYaRz+5krTf0wiua4UhjL2y50AXM=; b=e UxxAcBcKQIDIEAlh2819fWZ8ZK0SpPVNLszMBJbYQtG6NRYoh4is7YG4Deb7Hoh4 GYUOmIq9F04iNWSH5bgEMLjFdJi+4h/VeRYBuaZYqID4bhgZI4imLLeEHsgN+N3r 6SzBrtjU8DL1vOVr3RAEioYs9JREA3VUVgEY3horAEv704AKoMqVso4mp1IYDtjr qYyZdC3zL4y8oyDI2LqL5/y8zT6mA6hxBJlZzEaYjlYiSO7YHD+eaRWl7GBkhJRm GWZjPATaz4oyeOtqGf7rc1DIKelMs+S/vk7sZIXM0lFSKLpjl+KWS3uK94YZa1Br 9d7ygPkZWp7eRTvt31kZA== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgddukedtieehucetufdoteggodetrf dotffvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdggtfgfnhhsuhgsshgtrhhisggv pdfurfetoffkrfgpnffqhgenuceurghilhhouhhtmecufedttdenucesvcftvggtihhpih gvnhhtshculddquddttddmnecujfgurhepkfffgggfuffvvehfhfgjtgfgsehtjeertddt vdejnecuhfhrohhmpeetughrihgrnhcumfhlrghvvghruceorggurhhirghnrdhklhgrvh gvrhesrghklhgrvhgvrhdrtghomheqnecuggftrfgrthhtvghrnhephfeviefhveelffef tdehudekveefhfeftdegieefveetfffgfeehtdfftedutedtnecuvehluhhsthgvrhfuih iivgeptdenucfrrghrrghmpehmrghilhhfrhhomheprggurhhirghnrdhklhgrvhgvrhes rghklhgrvhgvrhdrtghomhdpnhgspghrtghpthhtohepfedpmhhouggvpehsmhhtphhouh htpdhrtghpthhtohepgihofhesthhhvggsuhhilhgurdgtohhmpdhrtghpthhtohepvggu vghnrgeslhgvghhithhsvggtuhhrihhthidrtghomhdprhgtphhtthhopehpghhsqhhlqd hgvghnvghrrghlsehlihhsthhsrdhpohhsthhgrhgvshhqlhdrohhrgh X-ME-Proxy: Feedback-ID: i76984098:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Mon, 31 Mar 2025 14:34:01 -0400 (EDT) Message-ID: Date: Mon, 31 Mar 2025 11:33:59 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [EXTERNAL] RDS IO Read time To: Christophe Pettus , Eden Aharoni Cc: "pgsql-general@lists.postgresql.org" References: Content-Language: en-US From: Adrian Klaver In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk On 3/31/25 11:23 AM, Christophe Pettus wrote: > > >> On Mar 31, 2025, at 10:54, Eden Aharoni wrote: >> >> So you believe it's strictly an EBS issue? You are asking about disk I/O, that is the purview of the OS and hardware. In your case both are created and managed by AWS, only they know what is going on behind the scenes. > > Well, PostgreSQL certainly can read faster than 34MB/s off of disk. With the data you've given, I can't really say if it's purely an EBS issue. > -- Adrian Klaver adrian.klaver@aklaver.com