From unknown Sun Jun 22 11:34:43 2025 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.509 (Entity 5.509) Content-Type: text/plain; charset=utf-8 From: bug#35205 <35205@debbugs.gnu.org> To: bug#35205 <35205@debbugs.gnu.org> Subject: Status: [PATCH] Document IBM Z environment variables Reply-To: bug#35205 <35205@debbugs.gnu.org> Date: Sun, 22 Jun 2025 18:34:43 +0000 retitle 35205 [PATCH] Document IBM Z environment variables reassign 35205 gzip submitter 35205 Ilya Leoshkevich severity 35205 normal tag 35205 patch thanks From debbugs-submit-bounces@debbugs.gnu.org Tue Apr 09 05:53:56 2019 Received: (at submit) by debbugs.gnu.org; 9 Apr 2019 09:53:56 +0000 Received: from localhost ([127.0.0.1]:50564 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1hDnS0-0008TW-7H for submit@debbugs.gnu.org; Tue, 09 Apr 2019 05:53:56 -0400 Received: from eggs.gnu.org ([209.51.188.92]:49266) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1hDnRy-0008TI-II for submit@debbugs.gnu.org; Tue, 09 Apr 2019 05:53:55 -0400 Received: from lists.gnu.org ([209.51.188.17]:36335) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hDnRt-0006AU-Bc for submit@debbugs.gnu.org; Tue, 09 Apr 2019 05:53:49 -0400 Received: from eggs.gnu.org ([209.51.188.92]:35415) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hDnRs-000078-7y for bug-gzip@gnu.org; Tue, 09 Apr 2019 05:53:49 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: * X-Spam-Status: No, score=1.5 required=5.0 tests=BAYES_50,KHOP_DYNAMIC, RCVD_IN_DNSWL_LOW autolearn=disabled version=3.3.2 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hDnRr-00069W-4T for bug-gzip@gnu.org; Tue, 09 Apr 2019 05:53:48 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:44648 helo=mx0a-001b2d01.pphosted.com) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hDnRq-00065e-T3 for bug-gzip@gnu.org; Tue, 09 Apr 2019 05:53:47 -0400 Received: from pps.filterd (m0098421.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x399jaKC142442 for ; Tue, 9 Apr 2019 05:53:41 -0400 Received: from e06smtp04.uk.ibm.com (e06smtp04.uk.ibm.com [195.75.94.100]) by mx0a-001b2d01.pphosted.com with ESMTP id 2rrrcwjc6r-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 09 Apr 2019 05:53:40 -0400 Received: from localhost by e06smtp04.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Tue, 9 Apr 2019 10:53:37 +0100 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x399rZcK62914794 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 9 Apr 2019 09:53:35 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6BAD3A4062; Tue, 9 Apr 2019 09:53:35 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4238FA405C; Tue, 9 Apr 2019 09:53:35 +0000 (GMT) Received: from white.boeblingen.de.ibm.com (unknown [9.152.98.226]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 9 Apr 2019 09:53:35 +0000 (GMT) From: Ilya Leoshkevich To: bug-gzip@gnu.org Subject: [PATCH] Document IBM Z environment variables Date: Tue, 9 Apr 2019 11:53:34 +0200 X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 19040909-0016-0000-0000-0000026CDCD7 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19040909-0017-0000-0000-000032C904DE Message-Id: <20190409095334.43865-1-iii@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-04-09_03:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=3 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904090063 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 148.163.158.5 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Spam-Score: 1.0 (+) X-Debbugs-Envelope-To: submit Cc: Ilya Leoshkevich X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -0.0 (/) IBM Z patch (7a6f9c9) introduced 5 environment variables, which are used to tune the compression and decompression with the DEFLATE COMPRESSION CALL instruction. This patch adds texinfo documentation for all of them. * doc/gzip.texi(Environment): Add DFLTCC* environment variables. --- doc/gzip.texi | 38 +++++++++++++++++++++++++++++++++++++- 1 file changed, 37 insertions(+), 1 deletion(-) diff --git a/doc/gzip.texi b/doc/gzip.texi index a6d9896..77b3a56 100644 --- a/doc/gzip.texi +++ b/doc/gzip.texi @@ -69,7 +69,7 @@ Free Documentation License''. * Sample:: Sample output from @command{gzip}. * Invoking gzip:: How to run @command{gzip}. * Advanced usage:: Concatenated files. -* Environment:: The @env{GZIP} environment variable +* Environment:: Environment variables. * Tapes:: Using @command{gzip} on tapes. * Problems:: Reporting bugs. * GNU Free Documentation License:: Copying and sharing this manual. @@ -513,6 +513,42 @@ export PATH=/usr/bin exec gzip -9 "$@@" @end example +The following environment variables are applicable only when using +@command{gzip} on IBM Z mainframes supporting DEFLATE COMPRESSION CALL +instruction: + +@table @option + +@item DFLTCC +Whether DEFLATE COMPRESSION CALL should be used. Default value is @samp{1}. +Set this to @samp{0} to disable DEFLATE COMPRESSION CALL altogether. + +@item DFLTCC_LEVEL_MASK +Compression levels on which DEFLATE COMPRESSION CALL should be used. +Represented as a bit mask in decimal or hexadecimal form, where each bit +corresponds to a compression level. Default value is @samp{2}, which means +level 1 only. In order to make use of DEFLATE COMPRESSION CALL by default, that +is, on levels 1-6, set this to @samp{0x7e}. + +@item DFLTCC_BLOCK_SIZE +Size of deflate blocks produced by DEFLATE COMPRESSION CALL in bytes in decimal +or hexadecimal form. Default value is @samp{1048576} (1 megabyte). When using +DEFLATE COMPRESSION CALL to compress a file containing heterogeneous data (e.g. +a @samp{.tar} archive containing text and binary files), setting this to a +smaller value may improve compression ratio. + +@item DFLTCC_FIRST_FHT_BLOCK_SIZE +Size of the first fixed deflate block produced by DEFLATE COMPRESSION CALL in +bytes in decimal or hexadecimal form. Default value is @samp{4096} (4 +kilobytes). When using DEFLATE COMPRESSION CALL to compress a small file, +setting this to a larger value may improve compression ratio. + +@item DFLTCC_RIBM +Value of "Reserved for IBM" field of DEFLATE COMPRESSION CALL parameter block. +Default value is @samp{0}. + +@end table + @node Tapes @chapter Using @command{gzip} on tapes @cindex tapes -- 2.21.0 From debbugs-submit-bounces@debbugs.gnu.org Fri Aug 13 10:48:54 2021 Received: (at control) by debbugs.gnu.org; 13 Aug 2021 14:48:54 +0000 Received: from localhost ([127.0.0.1]:42888 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mEYUQ-0002NZ-HT for submit@debbugs.gnu.org; Fri, 13 Aug 2021 10:48:54 -0400 Received: from mail-wm1-f52.google.com ([209.85.128.52]:42640) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mEYU8-0002MX-Pu for control@debbugs.gnu.org; Fri, 13 Aug 2021 10:48:41 -0400 Received: by mail-wm1-f52.google.com with SMTP id w21-20020a7bc1150000b02902e69ba66ce6so7085917wmi.1 for ; Fri, 13 Aug 2021 07:48:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=YevMCVzYEXgqLCiu4F97/8wtzcnWrAg3jxhhhLUOPBo=; b=BjathT38/jH0O60nUN4WBYLl+PnRachOKfP0knZNZJTxCwG69a6BWz3IdNGADg2pWV dGkiDk7uV7rBSTDbAWc6IktFp6pOn89I/hZ9aQZEOxeJoKJ4tgYXGkEkHWKikd3J2TdI OvW448skXDzWOLM+eIdvQNkLOlucY0ayLg/X1dX3NgW0P3Fr7VtiF1WWXwzX0bYSTovo rmsktcNoeh1KYXmojLmUFa+gGNw5X3UTHOsgtzlt97m8xbgAoVzRCnJPtYGFGxQnayCP f75PfgjznVF08vwnyXHa0uS/pL5yDdQeQQv4dNaUMqzlvCP+rRQl1I68QbKKA3dHRGJ0 M46g== X-Gm-Message-State: AOAM532Z2dYRov9weoMNyye9qKuDlA1GWOxJXmu9lKV4E6PS4aZTtNU7 L6/WCE4yFuKFmumjacsV6jcIpJ7P0m7GRhKbQbsuJn0jWMdVDbCb X-Google-Smtp-Source: ABdhPJw79T/zMgj6+9Vr0n3PKuKTfdSlm07gaW0TPw7w3OH8jeZpgLvQam5n/MgkE49mYCkQ8JmW1vkzxXu8n3t1W/I= X-Received: by 2002:a05:600c:b51:: with SMTP id k17mr3047750wmr.149.1628866110226; Fri, 13 Aug 2021 07:48:30 -0700 (PDT) MIME-Version: 1.0 From: Jim Meyering Date: Fri, 13 Aug 2021 16:48:18 +0200 Message-ID: Subject: To: GNU bug tracker automated control server Content-Type: text/plain; charset="UTF-8" X-Spam-Score: 2.5 (++) X-Spam-Report: Spam detection software, running on the system "debbugs.gnu.org", has NOT identified this incoming email as spam. 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