October 1998
Intermediate to advanced
374 pages
12h 6m
English
Content preview from Web Performance TuningBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
CPU
Look at any PC advertisement: the first specification given is usually the CPU speed, because PC buyers like to be able to compare numbers, and this is an easy number to use for comparisons. Ironically, most PC systems are not balanced: a high-power CPU is wasted on an inferior bus and disk. (On the other hand, the CPU isn’t really wasted from the PC maker’s point of view if that’s what gets you to buy the system.) A low-end Intel Pentium CPU running at 100MHz will end up spending most of its time waiting for its EISA bus and IDE disk. What you really want is a fast bus, a low-latency disk, and a lot of RAM. Systems sold as servers are generally better balanced, because they are rated on actual throughput.
Still, sometimes you are really utilizing 100% of your CPU and could
benefit from more power. Extensive database searches or calculations,
generating graphics on the fly, or running server-side Java may all
tax your CPU to its maximum. Use readily available Unix tools to
monitor your CPU usage. Run vmstat
1 for a while and look at the last three columns,
which are usually user, system,
and idle
time. If the idle time
is usually very low, say under 5%, then you may need more CPU power.
You can measure the same things with top or
perfmeter.
How much CPU power you need also depends on the speed of your client connections, the size of the content being served, and the number of clients. Say you’re serving a large (100K) file to hundreds of clients at the same time. If the clients ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.