[Bug 1701132] Re: Please use xz instead of pxz

2017-12-18 Thread Launchpad Bug Tracker 
This bug was fixed in the package livecd-rootfs - 2.408.25

---
livecd-rootfs (2.408.25) xenial; urgency=medium

  * Sort and list dependencies nicely
  * Depend on packages instead of installing them at run time
  * Use xz -T4 instead of pxz.
Supported xz versions before 5.2 accept the -T4 option but ignore it.
Also depend on xz-utils instead of downloading pxz. (LP: #1701132)

 -- Balint Reczey   Wed, 06 Dec 2017 11:34:04 +0100

** Changed in: livecd-rootfs (Ubuntu Xenial)
   Status: Fix Committed => Fix Released

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Title:
  Please use xz instead of pxz

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[Bug 1701132] Re: Please use xz instead of pxz

2017-12-14 Thread Chris Glass 
Verified by building cloud images using the proposed package and
ensuring the resulting artifacts were satisfactory.

** Tags removed: verification-needed verification-needed-xenial
** Tags added: verification-done verification-done-xenial

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  Please use xz instead of pxz

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[Bug 1701132] Re: Please use xz instead of pxz

2017-12-14 Thread Chris Glass 
(verified with 2.408.25)

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  Please use xz instead of pxz

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[Bug 1701132] Re: Please use xz instead of pxz

2017-12-07 Thread Brian Murray 
Hello Balint, or anyone else affected,

Accepted livecd-rootfs into xenial-proposed. The package will build now
and be available at https://launchpad.net/ubuntu/+source/livecd-
rootfs/2.408.25 in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-xenial to verification-done-xenial. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-xenial. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Tags added: verification-needed verification-needed-xenial

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  Please use xz instead of pxz

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[Bug 1701132] Re: Please use xz instead of pxz

2017-12-06 Thread Balint Reczey 
** Changed in: livecd-rootfs (Ubuntu Xenial)
   Status: In Progress => Fix Committed

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Title:
  Please use xz instead of pxz

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[Bug 1701132] Re: Please use xz instead of pxz

2017-12-05 Thread Balint Reczey 
** Description changed:

  [Impact]
  
-  * Livecd-rootfs switches from using pxz to xz
-  * Pxz is installed at run-time instead of being a package dependency and pxz 
is in universe despite livecd-rootfs being in main. Both of those are undesired 
and fixing them makes livecd-rootfs easier to maintain following best practice 
and policy in Ubuntu.
+  * Livecd-rootfs switches from using pxz to xz
+  * Pxz is installed at run-time instead of being a package dependency and pxz 
is in universe despite livecd-rootfs being in main. Both of those are undesired 
and fixing them makes livecd-rootfs easier to maintain following best practice 
and policy in Ubuntu.
  
  [Test Case]
  
-  * Livecd-rootfs in Xenial uses (p)xz only for compressing raspi2 images.
-To test the change install updated livecd-rootfs on armhf and create 
images setting the following environment variables: ARCH=armhf SUBARCH=raspi2 
PROJECT=ubuntu-cpc.
-Notice that the xz-compressed rapi2 image is still created.
+  * Livecd-rootfs in Xenial uses (p)xz only for compressing raspi2 images.
+    To test the change install updated livecd-rootfs on armhf and create 
images setting the following environment variables: ARCH=armhf SUBARCH=raspi2 
PROJECT=ubuntu-cpc.
+    Notice that the xz-compressed rapi2 image is still created.
+  * Test-build Xenial image and make sure they are not broken. A subset of 
those images are built in the autopkgtest suite.
  
  [Regression Potential]
  
-  * It is a known and accepted regression that raspi2 image generation takes 
more wall-clock time after switching to xz because while Xenial's xz version 
does accept the -T4 option it does not compress in a parallel manner.
-  * The original change in Artful set -0 compression for xz which resulted in 
~35% bigger compressed images. This regression is fixed in LP: #1732681 which 
is scheduled to be back-ported together with switching to xz.
-  * In case of this change causes regression it would manifest itself as 
failing build for raspi2, failing build for ubuntu-cpc images or increased 
raspi2 image size.
-  
+  * It is a known and accepted regression that raspi2 image generation takes 
more wall-clock time after switching to xz because while Xenial's xz version 
does accept the -T4 option it does not compress in a parallel manner.
+  * The original change in Artful set -0 compression for xz which resulted in 
~35% bigger compressed images. This regression is fixed in LP: #1732681 which 
is scheduled to be back-ported together with switching to xz.
+  * In case of this change causes regression it would manifest itself as 
failing build for raspi2, failing build for ubuntu-cpc images or increased 
raspi2 image size.
+ 
  [Original bug report text]
  
  Livecd-rootfs (main) 2.447 uses "pxz -T4" for xz compression, while pxz is 
not in main.
  Xz 5.2 also supports multi-threaded compression thus xz could easily replace 
current pxz usage.
  
  A quick test on compressing livecd.ubuntu-cpc.img (created by ubuntu-
  image) shows that there is very little difference in compressed file
  size while xz's -T4 brings substantial speedup in wall clock time:
  
  $ cat test-xz
  #!/bin/sh
  
  TESTFILE=$1
  echo "Compr.\tThreads\tWall.t\tUser.t\tSys.t\tRes.t" > times.txt
  echo "Wall.t\tUser.t\tSys.t\tRes.t" > decompression-times.txt
  echo "Size(kB)" > sizes.txt
  for threads in 1 4; do
  for compression in $(seq 0 9) $(seq -f '%0.fe' 0 9); do
  /usr/bin/time -a -o times.txt -f "-$compression\t 
-T$threads\t%e\t%U\t%S\t%M" -- xz -T$threads -$compression -k $TESTFILE
  /usr/bin/time -a -o decompression-times.txt -f "%e\t%U\t%S\t%M" -- xz 
-t $TESTFILE.xz
  ls -k -s $TESTFILE.xz | cut -d' ' -f1 >> sizes.txt
  rm $TESTFILE.xz
  done
  done
  paste times.txt decompression-times.txt sizes.txt > time-size.txt
  
  $ cat time-size.txt
  Compr.  Threads Wall.t  User.t  Sys.t   Res.t   Wall.t  User.t  Sys.t   Res.t 
  Size(kB)
  -0   -T163.48   63.07   0.4049321.251.160.082432  
  416324
  -1   -T1102.90  102.26  0.6311064   1.531.260.143252  
  414624
  -2   -T1131.04  130.40  0.6218544   1.431.270.094224  
  414616
  -3   -T1146.22  145.61  0.6033992   1.431.240.126364  
  414616
  -4   -T1142.24  141.76  0.4750488   1.341.210.106424  
  414584
  -5   -T1147.81  147.26  0.5397616   1.371.220.1010420 
  414564
  -6   -T1148.61  148.06  0.5497608   1.351.230.1010536 
  414564
  -7   -T1154.29  153.70  0.58191800  1.441.220.1418820 
  414564
  -8   -T1155.82  155.16  0.65380336  1.531.270.1335208 
  414564
  -9   -T1194.08  193.18  0.88691128  1.591.310.1367700 
  41
  -0e  -T176.81   76.31   0.4862961.271.210.052536  
  416256
  -1e  -T1116.49  115.96  0.53

[Bug 1701132] Re: Please use xz instead of pxz

2017-12-05 Thread Balint Reczey 
** Description changed:

+ [Impact]
+ 
+  * Livecd-rootfs switches from using pxz to xz
+  * Pxz is installed at run-time instead of being a package dependency and pxz 
is in universe despite livecd-rootfs being in main. Both of those are undesired 
and fixing them makes livecd-rootfs easier to maintain following best practice 
and policy in Ubuntu.
+ 
+ [Test Case]
+ 
+  * Livecd-rootfs in Xenial uses (p)xz only for compressing raspi2 images.
+To test the change install updated livecd-rootfs on armhf and create 
images setting the following environment variables: ARCH=armhf SUBARCH=raspi2 
PROJECT=ubuntu-cpc.
+Notice that the xz-compressed rapi2 image is still created.
+ 
+ [Regression Potential]
+ 
+  * It is a known and accepted regression that raspi2 image generation takes 
more wall-clock time after switching to xz because while Xenial's xz version 
does accept the -T4 option it does not compress in a parallel manner.
+  * The original change in Artful set -0 compression for xz which resulted in 
~35% bigger compressed images. This regression is fixed in LP: #1732681 which 
is scheduled to be back-ported together with switching to xz.
+  * In case of this change causes regression it would manifest itself as 
failing build for raspi2, failing build for ubuntu-cpc images or increased 
raspi2 image size.
+  
+ [Original bug report text]
+ 
  Livecd-rootfs (main) 2.447 uses "pxz -T4" for xz compression, while pxz is 
not in main.
  Xz 5.2 also supports multi-threaded compression thus xz could easily replace 
current pxz usage.
  
  A quick test on compressing livecd.ubuntu-cpc.img (created by ubuntu-
  image) shows that there is very little difference in compressed file
  size while xz's -T4 brings substantial speedup in wall clock time:
  
  $ cat test-xz
  #!/bin/sh
  
  TESTFILE=$1
  echo "Compr.\tThreads\tWall.t\tUser.t\tSys.t\tRes.t" > times.txt
  echo "Wall.t\tUser.t\tSys.t\tRes.t" > decompression-times.txt
  echo "Size(kB)" > sizes.txt
  for threads in 1 4; do
- for compression in $(seq 0 9) $(seq -f '%0.fe' 0 9); do
- /usr/bin/time -a -o times.txt -f "-$compression\t 
-T$threads\t%e\t%U\t%S\t%M" -- xz -T$threads -$compression -k $TESTFILE
- /usr/bin/time -a -o decompression-times.txt -f "%e\t%U\t%S\t%M" -- xz 
-t $TESTFILE.xz
- ls -k -s $TESTFILE.xz | cut -d' ' -f1 >> sizes.txt
- rm $TESTFILE.xz
- done
+ for compression in $(seq 0 9) $(seq -f '%0.fe' 0 9); do
+ /usr/bin/time -a -o times.txt -f "-$compression\t 
-T$threads\t%e\t%U\t%S\t%M" -- xz -T$threads -$compression -k $TESTFILE
+ /usr/bin/time -a -o decompression-times.txt -f "%e\t%U\t%S\t%M" -- xz 
-t $TESTFILE.xz
+ ls -k -s $TESTFILE.xz | cut -d' ' -f1 >> sizes.txt
+ rm $TESTFILE.xz
+ done
  done
  paste times.txt decompression-times.txt sizes.txt > time-size.txt
  
- $ cat time-size.txt 
+ $ cat time-size.txt
  Compr.  Threads Wall.t  User.t  Sys.t   Res.t   Wall.t  User.t  Sys.t   Res.t 
  Size(kB)
  -0   -T163.48   63.07   0.4049321.251.160.082432  
  416324
  -1   -T1102.90  102.26  0.6311064   1.531.260.143252  
  414624
  -2   -T1131.04  130.40  0.6218544   1.431.270.094224  
  414616
  -3   -T1146.22  145.61  0.6033992   1.431.240.126364  
  414616
  -4   -T1142.24  141.76  0.4750488   1.341.210.106424  
  414584
  -5   -T1147.81  147.26  0.5397616   1.371.220.1010420 
  414564
  -6   -T1148.61  148.06  0.5497608   1.351.230.1010536 
  414564
  -7   -T1154.29  153.70  0.58191800  1.441.220.1418820 
  414564
  -8   -T1155.82  155.16  0.65380336  1.531.270.1335208 
  414564
  -9   -T1194.08  193.18  0.88691128  1.591.310.1367700 
  41
  -0e  -T176.81   76.31   0.4862961.271.210.052536  
  416256
  -1e  -T1116.49  115.96  0.5315068   1.281.200.073232  
  414568
  -2e  -T1137.13  136.62  0.5026892   1.301.200.104292  
  414564
  -3e  -T1144.34  143.84  0.4950556   1.311.210.096340  
  414564
  -4e  -T1146.93  146.48  0.4450412   1.301.200.106340  
  414568
  -5e  -T1150.59  150.04  0.5397552   1.321.220.1010416 
  414564
  -6e  -T1153.40  152.77  0.6297564   1.321.220.0910404 
  414568
  -7e  -T1157.10  156.46  0.62191956  1.351.260.0818548 
  414568
  -8e  -T1160.36  159.66  0.69380248  1.461.250.1335040 
  414568
  -9e  -T1198.32  197.42  0.88691256  1.491.190.1467648 
  414448
  -0   -T421.97   86.83   0.4024896   1.281.220.052448  
  416368
  -1   -T435.73   140.12  0.4573456   1.291.220.063136  
  414640
  -2

[Bug 1701132] Re: Please use xz instead of pxz

2017-11-16 Thread Balint Reczey 
I opened LP: #1732681 to clarify if the regression is acceptable or xz
should use a different compression than -0.

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  Please use xz instead of pxz

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[Bug 1701132] Re: Please use xz instead of pxz

2017-11-15 Thread Balint Reczey 
The original command's CPU usage is the following in xenial:
rbalint@xenial-test:~/Downloads$ time pxz -T4 -c 
ubuntu-16.04.3-preinstalled-server-armhf+raspi2.img > 
ubuntu-16.04.3-preinstalled-server-armhf+raspi2.img.p.xz

real3m31.117s
user10m12.812s
sys 0m17.988s

rbalint@xenial-test:~/Downloads$ ls -al 
ubuntu-16.04.3-preinstalled-server-armhf+raspi2.img.p.xz 
-rw-rw-r-- 1 rbalint rbalint 254621780 Nov 16 00:03 
ubuntu-16.04.3-preinstalled-server-armhf+raspi2.img.p.xz

On the same system I retested the matrix of xz options and it shows that
-T is ignored and -3 has the closest wall clock time with 258680 kB
result which is slightly larger than the original but even -8 consumes
system time and creates smaller compressed image:

rbalint@xenial-test:~/Downloads/xz-test$ cat time-size.txt 
Compr.  Threads Wall.t  User.t  Sys.t   Res.t   Wall.t  User.t  Sys.t   Res.t   
Size(kB)
-0   -T182.59   74.28   1.51479225.38   25.16   0.102404
329984
-1   -T1109.10  96.64   1.6310712   23.63   22.55   0.083080
298056
-2   -T1136.69  127.53  1.7818392   22.36   21.71   0.084196
286276
-3   -T1164.91  158.57  1.6433948   21.46   20.93   0.096260
275036
-4   -T1320.00  314.05  1.9050320   21.18   20.86   0.136120
258680
-5   -T1375.79  370.80  1.8297480   20.46   20.23   0.1010340   
247316
-6   -T1476.02  471.64  2.0697416   20.45   20.18   0.1010352   
245768
-7   -T1497.44  492.16  2.35191624  21.24   20.06   0.0918408   
240188
-8   -T1513.29  507.79  2.24380108  19.43   19.16   0.1034908   
229736
-9   -T1873.02  579.58  7.55690952  22.61   19.30   0.1467700   
224492
-0e  -T1746.35  743.14  1.76622423.69   23.32   0.112420
301004
-1e  -T1809.93  806.56  1.9814988   21.57   21.31   0.113180
272976
-2e  -T1846.12  843.60  1.8226748   22.10   20.75   0.074140
262860
-3e  -T1699.59  696.83  1.9750316   20.90   20.68   0.076260
252052
-4e  -T1879.00  875.42  2.0450256   20.35   19.96   0.106292
252048
-5e  -T1723.80  720.15  1.8197480   21.35   20.37   0.1110360   
245172
-6e  -T1911.69  908.11  2.0397464   20.37   19.83   0.0710348   
245168
-7e  -T1942.32  936.49  2.09191616  19.72   19.25   0.1218352   
239552
-8e  -T1967.20  962.26  2.42380156  18.85   18.07   0.1434904   
228956
-9e  -T11177.95 1036.56 6.36690784  19.78   18.08   0.1167680   
223748
-0   -T481.56   73.64   1.46482029.27   25.82   0.092252
329984
-1   -T4103.68  95.14   1.6710800   24.41   22.86   0.123180
298060
-2   -T4134.05  126.22  1.7618480   22.06   21.65   0.134232
286276
-3   -T4170.57  162.72  1.7233812   21.62   20.94   0.126188
275036
-4   -T4322.15  317.83  2.1050284   21.55   21.05   0.076136
258684
-5   -T4407.15  399.93  1.9297656   21.85   20.50   0.1210412   
247320
-6   -T4478.64  473.32  1.9597660   21.92   20.34   0.0910348   
245772
-7   -T4493.97  485.52  1.99191692  20.66   20.01   0.0818548   
240192
-8   -T4512.28  506.08  2.20380096  22.03   19.58   0.1134888   
229740
-9   -T4652.71  559.20  4.78691076  20.57   19.15   0.0867700   
224496
-0e  -T4750.00  743.68  1.74617224.59   23.34   0.112444
301004
-1e  -T4812.97  805.57  1.9415004   21.81   21.36   0.113280
272976
-2e  -T4849.79  842.25  2.0526828   20.96   20.63   0.124312
262860
-3e  -T4702.49  696.67  1.6950380   20.85   20.61   0.096360
252056
-4e  -T4882.09  874.62  1.9750552   20.11   19.89   0.086292
252052
-5e  -T4725.29  719.12  1.9097512   20.42   20.20   0.0610320   
245176
-6e  -T4917.31  908.11  1.8797632   20.26   19.78   0.1210312   
245168
-7e  -T4941.70  935.85  1.91191656  20.47   19.27   0.1018432   
239552
-8e  -T4966.09  961.14  2.21380140  18.52   18.10   0.1335028   
228956
-9e  -T41147.79 1040.24 5.46690956  19.88   18.09   0.0667612   
223748

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Title:
  Please use xz instead of pxz

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[Bug 1701132] Re: Please use xz instead of pxz

2017-11-15 Thread Balint Reczey 
Please disregard my previous result, the xz -0 does generate a bigger
.xz , it was a test running in parallel which updated the .xz file.

I'll attach the full test results when it is finished, but the actual file size 
was bigger with xz -0:
323Mubuntu-16.04.3-preinstalled-server-armhf+raspi2.img.xz

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Title:
  Please use xz instead of pxz

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[Bug 1701132] Re: Please use xz instead of pxz

2017-11-15 Thread Balint Reczey 
I tested the change with the image we actually ship with .xz compression
and to my greatest surprise xz -0 actually performed much better than
pxz with default compression:

$ du -sh *
1.2Gubuntu-16.04.3-preinstalled-server-armhf+raspi2.img
243Mubuntu-16.04.3-preinstalled-server-armhf+raspi2.img.orig.xz
243Mubuntu-16.04.3-preinstalled-server-armhf+raspi2.img.p.xz
168Mubuntu-16.04.3-preinstalled-server-armhf+raspi2.img.xz

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  Please use xz instead of pxz

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[Bug 1701132] Re: Please use xz instead of pxz

2017-07-25 Thread Launchpad Bug Tracker 
This bug was fixed in the package livecd-rootfs - 2.448

---
livecd-rootfs (2.448) artful; urgency=medium

  [ Balint Reczey ]
  * Depend on packages in main instead of installing them at runtime
  * Depend on vmdk-stream-converter instead of installing it at run time
  * Use xz -T4 -0 instead of pxz (LP: #1701132)
Supported xz versions before 5.2 also accept the -T4 option but ignore
it.
  * Depend on xz-utils instead of pxz

  [ Mathieu Trudel-Lapierre ]
  * auto/config: enable Debug::pkgDepCache::AutoInstall so tracking down
dependency bugs in the livefs is a little clearer.

  [ Robert C Jennings ]
  * live-build/functions: Update path for VMDKstream.py (LP: #1706116)

 -- Brian Murray   Mon, 24 Jul 2017 11:06:24 -0700

** Changed in: livecd-rootfs (Ubuntu)
   Status: New => Fix Released

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Title:
  Please use xz instead of pxz

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[Bug 1701132] Re: Please use xz instead of pxz

2017-06-28 Thread Balint Reczey 
** Branch linked: lp:~rbalint/livecd-rootfs/xz

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Title:
  Please use xz instead of pxz

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[Bug 1701132] Re: Please use xz instead of pxz

2017-06-28 Thread Balint Reczey 
** Attachment added: "Nicely indented test results"
   
https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/1701132/+attachment/4905008/+files/time-size.txt

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Title:
  Please use xz instead of pxz

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