Berkeley CSUA MOTD:Entry 52565
Berkeley CSUA MOTD
2017/10/19 [General] UID:1000 Activity:popular

2009/2/13-18 [Computer/HW/Memory, Computer/Domains] UID:52565 Activity:nil
2/13    Question about memory relocation:
        These days most h/w has a relocation register. Could the relocation
        address be stored on disk or in kernel memory vs. in a register? Yes,
        that would be slow but is it possible? Do you *need* a relocation
        register or does it exist purely for performance reasons? I was
        reading some paper written by IBM in the 1960s that seemed to
        imply the former and I don't understand why that would be.
        \_ What "relocation register" is this?  If you're talking about the
           one that (say) the IBM 7090 used for time-sharing, that's been
           obsolete for 30 years; modern machines use virtual memory.  (And
           the tables defining the virtual-memory mapping are in fact stored
           in kernel memory, since they're too big to fit in a register.)
           Or did you have something else in mind?
           \_ Yes, but modern machines still have a base register. Do
              they need it?
              \_ What do you mean by a "base register"?  It would help if you
                 could say exactly which register you're talking about on some
                 real architecture (x86, PowerPC, MIPS, etc.), or at least if
                 you could describe what this register does.
        \_ Because comparing 1960s computer hardware to today's is like asking
           why drivers need a whip to make their cars drive faster because
           you saw a picture of a horse drawn carriage.
           \_ Well, no. Modern hardware still does it that way. The
              question is: Does it *have* to?
2017/10/19 [General] UID:1000 Activity:popular

You may also be interested in these entries...
2012/12/18-2013/1/24 [Computer/SW/Languages/Perl] UID:54561 Activity:nil
12/18   Happy 25th birthday Perl, and FUCK YOU Larry Wall for fucking up
        the computer science formalism that sets back compilers development
        back for at least a decade:
        \_ I tried to learn Perl but was scared away by it.  Maybe scripting
           lanauages have to be like that in order to work well?
2012/2/5-3/26 [Computer/SW/WWW/Browsers] UID:54300 Activity:nil
2/5     How is Firefox on version 10, while I still have 3.6 installed.
        I wait for the X.1 versions and they never come out.
        \_ I'm also on 3.6.26.  It claims that versions 4 - 10 are all faster
           than 3.6.x, but do they use more memory?  Thx.
           \_ Newer Firefox versions use less memory too:
2011/6/5-8/27 [Computer/HW/Memory] UID:54127 Activity:nil
6/5     In an effort to stabilize our services, we'll be rebuilding parts of
        the CSUA infrastructure over the course of this summer.  To give us
        some wiggle room, I've temporarily decreased soda's allocated RAM from
        8GB to 2GB.  If you need to run something that requires large amounts
        of memory, please send mail to and we'll try to
        accommodate your request.  --jordan
2011/3/26-4/20 [Computer/HW/Memory] UID:54062 Activity:nil
3/19    When you're explaining the stack to people do you draw it with the
        highest addresses at the top or at the bottom?
        \_ When I explain any memory layout including stacks, I draw with the
           highest addresses at the bottom.  But I've seen people doing the
           other way.  -- yuen
           \_ do you by any chance have seen or have a jpg of the full memory
2010/7/25-8/25 [Computer/SW/Graphics] UID:53897 Activity:nil
7/25    What's up with that moving bit pattern that Win7 displays when it
        boots up?  (It's the one that's like in the Apple II days when you
        use the graphics memory for code or data while it's still in HGR
        mode.)  Is there a way to disable that?  It slows things down a lot
        every time I reboot my Win7 VM on my office machine if I RDP to the
        machine via DSL.  Thanks in advance.
2010/5/26-6/30 [Computer/SW/Unix/WindowManager, Computer/SW/OS/OsX] UID:53844 Activity:nil
5/26    anyone use lxde?  supposedly it is less stupid than xfce and
        less bloated than gnome.  thoughts?
        \_ lol, does anyone still use desktop linux?  Get with the times
           buy a mac.  Now.  DO IT.  Go NOW.
           \_ but we prefer herring to Kool-Aid
              \_ "you have to yell, he's hard of herring"
2010/6/4-30 [Computer/SW/Languages/C_Cplusplus] UID:53849 Activity:nil
6/4     Is this valid C++ code?
        std::string getStr(void) {
            std::string str("foo");
            return str;
        void foo(char *s);
2009/12/7-2010/1/3 [Computer/HW/Memory, Computer/HW] UID:53574 Activity:nil
12/7    How many TCP retransmits are too many? Here is what I get:
            3594143433 segments received
            3760174421 segments send out
            3801829561 segments retransmited
        \_ rephrase. you can never have too much money. or too little.
           what is, is.
2009/10/27-11/3 [Computer/HW/Drives] UID:53474 Activity:nil
10/27   I just read an article that Facebook had moved their database
        to all SSD to speed throughput, but now I can't find it. Has
        anyone else seen this? Any experience with doing this? -ausman
        \_ I hope you're not running mission critical data:
        \_ Do you have any idea how much storage space is used by Facebook,
2009/7/21-24 [Computer/SW/Languages/Java] UID:53168 Activity:moderate
7/20    For those who care btw, it looks like eclipse is now A Standard Tool
        at UCB ugrad cs, probably replaced emacs.  Furthermore, people get
        angry at seeing Makefiles, (since eclispe takes care of that).  I
        guess it's just a sign of the times.
        \_ The more people at my work use eclipse the less the code is
           managable in emacs.  I'm not sure which application's fault
2009/8/4-13 [Computer/SW/OS/Windows] UID:53239 Activity:kinda low
8/3     VMWare + Windows XP + Validation question. I need to test stuff with
        Service Pack 3 installed. I have a valid key that I own (yeah yeah I
        actually *bought* a copy, please don't flame me for supporting evil
        M$). Is it possible to register the key once, and then duplicate it
        for testing purposes?  Will Windows or Microsoft detect copies and
        disable the rest the copies?
2009/5/6 [Computer/HW/CPU] UID:52952 Activity:moderate
5/5     Any idea why the AMD only added 8 more registers with the AMD64 arch.?
        Why 16 registers and not, say, 32?
        \_ To double the accessible register count, you need one more bit
           in the instruction stream _per_ register field.  x86 instruction
           set is already packed like rat's nest as is.
2009/2/27-3/5 [Computer/Networking] UID:52658 Activity:nil
2/27    I need to buy a wireless router, can u guys help me out?   I need the
        following features:  wireless, G or better, PPTP dial up, PPoE dialup,
        VoIP/SIP register, DDNS, uPnP.
        I am having a such hard time to find a review site which allow me to
        select these features.   Any ideas?  There are a couple model from
        this small company Draytek has these features, I am having the hardest
2008/10/29-31 [Computer/Domains] UID:51717 Activity:nil
10/29   I became a citizen half a year ago, and I filled out a voter
        registration form at the oath ceremony.  Now do I have to register
        again with the state, county (Alameda) and city (Fremont) before I can
        vote on their ballots?  Thanks.
        \_ register at your nearest park bench
        \_ Just fill out a voter registration form and drop it in the mail.