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The time now is Thu 24 Sep 2020, 14:41 All times are UTC - 4 |
 Forum index » House Training » Users ( For the regulars ) |
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psav=....conquering/understanding puppy boot command(s)
Moderators: Flash, Ian, JohnMurga |
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Sailor Enceladus
Joined: 22 Feb 2016 Posts: 1566 |
Yup. I have 1GB Ram and sometimes Firefox freezes and I have to kill it then restart it if I don't have my 2GB swap partition. |
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backi
Joined: 27 Feb 2011 Posts: 2007 Location: GERMANY |
Hi Sailor Encaladus ! Did you ever tried Zram ? ......useful if you have only 1 Gig or less Ram . If not Google for it ....or if you are on Tahrpup .....just install with PPM..... zram-config ...save. After reboot it is activ .Almost no configuration . Don`t know if there is a thread here on the Forum .....if not it would maybe useful.....for Machines with less Ram. |
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6502coder
 Joined: 23 Mar 2009 Posts: 682 Location: Western United States |
Well, all my Puppy installations to hard disk are frugal, and I always set up a swap partition. My 412 Retro machine has 96 MB RAM and 384 MB of swap. My Wary 5141 machine has 192 MB RAM and 1 GB of swap. On both of these machines, I do see the swap partition being used from time to time. Even my Precise machine with 1 GB RAM uses its swap partition now and then. |
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greengeek
 Joined: 20 Jul 2010 Posts: 5834 Location: Republic of Novo Zelande |
eg: browser cache has to increase, calculating space has to be allocated for spreadsheets, word processing etc etc. Then there's ripping of music and videos, and especially processing of videos - these can easily outstrip our available free ram. What if your pup was 200MB, your savefile 512MB and your ram was 512MB. Already you have a problem. And what if you then load a decent sized Libreoffice sfs, maybe also Librecad, and then opened Chrome and did some browsing? Uh-oh, tits up. The worst situation is where the puppy keeps on running (ie doesn't crash) runs low on free ram and you keep on manipulating data. What gets written back to your savefile? If you combine two issues - 1) Low ram due to no swap space and 2) long write times to usb stick - you get corruptions that are hard to explain. I reckon that running without swap space should be limited to sessions where all data will be dumped at end of session, and no write attempts are made to usb or hard disk. Remastering can use heaps of ram too - so i think swap space is compulsory for that type of operation also. |
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bigpup
 Joined: 11 Oct 2009 Posts: 13981 Location: S.C. USA |
Why are some people so afraid to setup swap on their computers? 
It is there to assist ram IF needed. 
All it does is take up some space on whatever storage device you have swap on. Most of the newer Puppies have swap usage setup to start when ram gets down to 40% free. Why worry when that happens, just let it happen. Do you really know what each program is doing with ram at all times? No!
_________________ The things they do not tell you, are usually the clue to solving the problem. When I was a kid I wanted to be older.... This is not what I expected
YaPI(any iso installer) |
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Burn_IT
 Joined: 12 Aug 2006 Posts: 3702 Location: Tamworth UK |
It is a bit like when you go into a store you pick up a basket to temporarily hold things. You may well put things back on the shelves before going to the checkout, paying, and tranferring to your own carrier. _________________ "Just think of it as leaving early to avoid the rush" - T Pratchett |
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greengeek
Joined: 20 Jul 2010 Posts: 5834 Location: Republic of Novo Zelande |
Of course you can always set up a separate usb stick which has been formatted with only a swap partition - no data or boot partitions at all. That way if you run out of free ram your system can still run by using the swap space on that separate usb stick - and you can still unplug the other usb stick that contains your boot files and data. But i think the original question remains - how to force savefile/savefolder to load into ram initially (and completely) during boot? |
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Pelo
Joined: 10 Sep 2011 Posts: 12591 Location: Mer méditerrannée (1 kms°) |
Bookmarked for translation fr. Because of much interest. _________________ Passenger Pelo ! don't ask him to repair the aircraft. Don't use him as a demining dog .... pleeease. |
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Pelo
Joined: 10 Sep 2011 Posts: 12591 Location: Mer méditerrannée (1 kms°) |
savefile is the first to be installed.. Savefile=your files storage (menu.lst). So you need a savefile. Else how to know what to load at boot ? some german users told us to remasterize your ISO before shutdown.. Easy, clever idea.. 
_________________ Passenger Pelo ! don't ask him to repair the aircraft. Don't use him as a demining dog .... pleeease. |
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greengeek
Joined: 20 Jul 2010 Posts: 5834 Location: Republic of Novo Zelande |
How is this done? Is it easy to modify initrd so that it accepts a new sfs as the top layer? |
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rufwoof
 Joined: 24 Feb 2014 Posts: 3725 |
Fatdog usb multi-session works well the way you want. Boot from usb, loads saves from the same usb, unplug the usb once booted. You do however have to set the Save Session Interval to zero (only save on demand, never automatically/timed). To save, re-attach USB and click the Save desktop icon.
I've also set up a 16GB encrypted swap partition on HDD for the times when I do something like downloading a massively large iso or music/video file into /root. I don't save that however, move it elsewhere (HDD/server). When swap does get used it runs fine. I did comment out a swapoff in /etc/rc.d/rc.local however as with that left in it could stall during shutdowns/reboots. Mostly I just boot, use, shutdown (no saving). Except when a new Chrome version comes out when I boot, install chrome, save. So clean system and browser at each reboot. For bookmarks I use tilda drop down terminal (F1 toggles showing/hiding it) and tilda highlights all urls (just click a url to open chrome on that web page). So I have tilda auto-loaded with editing a text file containing my bookmarks so that they're easily accessible at any time (press F1 to show/hide) and easily edited. I have previously experimented with setting up swap early - within initrd and prior to the saves being loaded, so even with large saves if you have the swap space it would load into ram + swap. Worked OK, but was like a full install i.e. HDD read/write delays rather than running totally in ram. I've yet to get a Puppy working in a manner where you can boot from usb/load saves from usb/unplug usb once booted. The way Fatdog does that is its like a CD/DVD multi-session, but using usb instead. And instead of save files it uses sfs's. Each new save creates another sfs and on bootup they get loaded into /aufs/pup_multi, whilst changes get stored in /aufs/pup_save. A trick is to boot, delete all of those save sfs's and then run a save action, which in effect re-writes the /aufs/pup_multi content to a single new sfs save file - sort of like defragmenting multiple save sfs's into one . When there are multiple save sfs you can use boot parameters to not load n number of previous saves, or just simply delete/rename them. Multi-saves are nice when you want to change things, reboot and try them out, but then rollback to undo that (i.e. delete the most recent save sfs and reboot again). That boot main sfs and saves from usb/unplug usb feature is one of the main reasons I run Fatdog, having your MBR, grldr, vmlinuz, main sfs and save sfs's all on a disconnected usb once booted is very comforting/secure. _________________ ( ͡° ͜ʖ ͡°) :wq Fatdog multi-session usb echo url|sed -e 's/^/(c/' -e 's/$/ hashbang.sh)/'|sh Last edited by rufwoof on Wed 31 Jul 2019, 05:05; edited 2 times in total |
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Flash
Official Dog Handler  Joined: 04 May 2005 Posts: 13653 Location: Arizona USA |
You might not have to delete the offending saved session to not use it. If Fatdog really works like a multisession DVD, there is a boot option that you can enter to make Puppy skip certain saved sessions. It's been a long time since I used it, so I forget what it is. |
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rufwoof
Joined: 24 Feb 2014 Posts: 3725 |
Hi Flash In Fatdog, you just append the number of last saves you want to skip being loaded to the end of the savefile kernel boot parameter, i.e. my previous example grub4dos (menu.lst) boot code of savefile=direct:multi:uuid:2d5fb1e2-5276-4950-bc8c-0b3c1ec9cfa6:: becomes savefile=direct:multi:uuid:2d5fb1e2-5276-4950-bc8c-0b3c1ec9cfa6::2 if you want to skip loading of the two last saves. I believe the last two colons in the savefile parameter aren't actually required when the values they separate are null (empty) i.e. it could be just savefile=direct:multi:uuid:2d5fb1e2-5276-4950-bc8c-0b3c1ec9cfa6 But I leave the two colons there purely as a reminder of where the skip n saves value should be added. I used uuid's for disk identification as that's more static (uuid's are revealed by running "blkid" command). Using sda1 or sda2 or whatever type names can otherwise see those change at bootup if other block devices such as a usb have been inserted. If for example your HDD is usually /dev/sda1, but you have a usb inserted during another boot, then the kernel could allocate that usb as being /dev/sda1 and your hdd as /dev/sdb1. That's random, and at another reboot it might be back to the hdd being sda1 and usb as sdb1. Even uuid's can change however, but tend to do so less rarely under usual/general usage. _________________ ( ͡° ͜ʖ ͡°) :wq Fatdog multi-session usb echo url|sed -e 's/^/(c/' -e 's/$/ hashbang.sh)/'|sh |
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rufwoof
Joined: 24 Feb 2014 Posts: 3725 |
(Belated) thanks drunkjedi If you're less concerned about the filesize of fd64.sfs, then swapping it to use lz4 compression knocks quite a bit off the boot time. unsquashfs fd64.sfs mv fd64.sfs fd64.old.sfs mksquashfs squashfs-root fd64.sfs -comp lz4 rm -rf squashfs-root Under grub4dos/menu.lst, booting from usb (small initrd - with no fd64.sfs contained within that) with multisession saves back to usb, but with swap and fd64.sfs on hdd
Boots reasonably quickly, htop shows low memory utilisation, and once booted the usb and hdd can both be unmounted (ensure save session interval is set to zero). Now making that my default boot settings for my fatdog usb multisession 
_________________ ( ͡° ͜ʖ ͡°) :wq Fatdog multi-session usb echo url|sed -e 's/^/(c/' -e 's/$/ hashbang.sh)/'|sh |
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Hello,
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