Berkeley CSUA MOTD:Entry 43671
Berkeley CSUA MOTD
 
WIKI | FAQ | Tech FAQ
http://csua.com/feed/
2025/07/08 [General] UID:1000 Activity:popular
7/8     

2006/7/14-18 [Computer/HW/Memory, Computer/SW/Unix] UID:43671 Activity:nil
7/14    So as I understand it, Intel introduced Hyperthreading because the
        penalty for a cache miss or branch misprediction on Netburst was huge
        so to make up for it they could work on a different thread while
        waiting for memory latency.  Given that the Core2 architecture has
        such a wide execution path, couldn't they use HT to try and keep all
        those execution units full?
        \_ I attended one of Intel's talks on campus and the "huge penalty"
           myth is a myth. As the number of pipelines increases, the depth
           of the miss and a pipe flush is longer, yes. However, keep in mind
           that since each stage in the pipe is shorter the clock cycle is
           also faster. Thus, in terms of absolute time (time=number of
           pipes that need to be flushed * cycle time), the increase in P4
           from the old architecture is only increased by ~20% time, which
           is insignificant in computer science speak.
             As for keeping execution units full, it's very much application
           dependent. Even with the huge instruction reorder mechanisms some
           applications still can't utilize them all.
2025/07/08 [General] UID:1000 Activity:popular
7/8     

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:
        http://techcrunch.com/2012/12/18/print-happy-25th-birthday-perl
        \_ 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:
              http://www.maximumpc.com/article/news/mozillas_memshrink_program_brings_big_memory_savings_firefox_7
	...
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 root@csua.org 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.
	...
2009/12/3-26 [Computer/Companies/Google] UID:53563 Activity:nil
12/2    Google launches its own DNS. Google Public DNS:
        http://code.google.com/speed/public-dns
        8.8.8.8 and 8.8.4.4
        Kick ass!
        \_ http://radoff.com/blog/2009/12/07/google-dns-benchmarking-and-rationale
        \_ I get 1.7ms pings to 4.2.2.2 and 23ms pings to 8.8.8.8.
	...