From nobody Thu Apr 6 16:08:43 2023 X-Original-To: freebsd-current@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4Psmdl137vz44X2R for ; Thu, 6 Apr 2023 16:08:59 +0000 (UTC) (envelope-from asomers@gmail.com) Received: from mail-vs1-f46.google.com (mail-vs1-f46.google.com [209.85.217.46]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1D4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Psmdj2xcbz3n56 for ; Thu, 6 Apr 2023 16:08:57 +0000 (UTC) (envelope-from asomers@gmail.com) Authentication-Results: mx1.freebsd.org; dkim=none; spf=pass (mx1.freebsd.org: domain of asomers@gmail.com designates 209.85.217.46 as permitted sender) smtp.mailfrom=asomers@gmail.com; dmarc=none Received: by mail-vs1-f46.google.com with SMTP id h15so34871780vsh.0 for ; Thu, 06 Apr 2023 09:08:57 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680797335; x=1683389335; h=to:subject:message-id:date:from:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=U4kS0hCfGDMDj5xyOmzOWuVdgBOItr9xzzRlFEpwWN8=; b=nRiwIgiIi/aXmutx0EzfGRZ1vZbILtXebBmBuH9C/ZJTsCgemGlfbrHtN+ITKdtKLk Q8o3UVywQqaLmq+g6nvkiehluj8JLSZimXehj/ZzHJr2raCtqHL6ETaCT+ZWUba6BTiW iS1BNnkZMm/LsBB57zXnIoW7UwJP71qn6/LDdEg/SiC+h1Lh7GXO5gH1b8nwIXjwxqY8 eU+HyR1C/hyyPoLdT6J0gNB2l71qGrdn754vNCt0wTODyeYbxxMipmdeyeWlXa6nNz2+ QU7rm0GFL/xwJqlaJ2Tyll5UKOYWKgPduQVxqlPxY003FRlKf7oS/u07wOK9G78LSyDe edRA== X-Gm-Message-State: AAQBX9efCnZjmiN9y/fiMlKr7JmOR13jfL0Y8WsCe3N0VKU3LpTxPJ0d XmkssOqunc3da3qxp18O7EBLFBmFb44xrXvYTI39b8kF X-Google-Smtp-Source: AKy350YPv3dVtkDwEU8kYTbxnLIveH3MfYhO2XI/LAdNJfAzyZVmRAC2S0BXcE16F4RFW3V92kWHegdjH/nH3ihsIjo= X-Received: by 2002:a67:cc10:0:b0:425:d6a1:1738 with SMTP id q16-20020a67cc10000000b00425d6a11738mr14477vsl.4.1680797334814; Thu, 06 Apr 2023 09:08:54 -0700 (PDT) List-Id: Discussions about the use of FreeBSD-current List-Archive: https://lists.freebsd.org/archives/freebsd-current List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-current@freebsd.org MIME-Version: 1.0 From: Alan Somers Date: Thu, 6 Apr 2023 09:08:43 -0700 Message-ID: Subject: textdumps are too slow To: FreeBSD CURRENT Content-Type: text/plain; charset="UTF-8" X-Spamd-Result: default: False [-1.49 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-0.998]; NEURAL_HAM_LONG(-0.57)[-0.570]; FORGED_SENDER(0.30)[asomers@freebsd.org,asomers@gmail.com]; R_SPF_ALLOW(-0.20)[+ip4:209.85.128.0/17]; MIME_GOOD(-0.10)[text/plain]; NEURAL_SPAM_SHORT(0.08)[0.076]; MLMMJ_DEST(0.00)[freebsd-current@freebsd.org]; MIME_TRACE(0.00)[0:+]; RWL_MAILSPIKE_POSSIBLE(0.00)[209.85.217.46:from]; ASN(0.00)[asn:15169, ipnet:209.85.128.0/17, country:US]; RCVD_IN_DNSWL_NONE(0.00)[209.85.217.46:from]; FREEMAIL_ENVFROM(0.00)[gmail.com]; R_DKIM_NA(0.00)[]; TO_DN_ALL(0.00)[]; RCVD_TLS_LAST(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; FREEFALL_USER(0.00)[asomers]; RCVD_COUNT_TWO(0.00)[2]; ARC_NA(0.00)[]; FROM_NEQ_ENVFROM(0.00)[asomers@freebsd.org,asomers@gmail.com]; FROM_HAS_DN(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-current@freebsd.org]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DMARC_NA(0.00)[freebsd.org]; TO_DOM_EQ_FROM_DOM(0.00)[] X-Rspamd-Queue-Id: 4Psmdj2xcbz3n56 X-Spamd-Bar: - X-ThisMailContainsUnwantedMimeParts: N I have servers with lots of RAM yet slow swap disks. So full crash dumps are too slow. Instead, I use textdumps, which are theoretically much faster. However, these servers also have about 10,000 threads apiece, so textdumps are also slow. They take tens of minutes. I have dual console setup: both serial and video. It seems to me that the speed of the textdump might be limited by the video system. So is there anyway to capture a textdump without printing everything to the console? textdump(4) implies that there isn't; you must print stuff to console in order to capture it, and you must capture in order to dump. Would somebody please tell me that I'm wrong? -Alan