Jerry Lampi wrote:
On Fri, Jul 12, 2013 at 2:27 PM, Christopher Schultz <
ch...@christopherschultz.net> wrote:
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Jerry,
On 7/12/13 2:16 PM, Jerry Lampi wrote:
When we switched from tomcat 6.0.35 to 6.0.36, the initial load of
our sign on page became extremely slow. In 6.0.35, it would load
in about 2 seconds; in 6.0.36, it loads in about 60 seconds.
Can you be more specific? Is it the "sign-in page" resource that takes
60-seconds to load, or do you mean the sign-in page plus all of its
associated resources (graphics, css, applets, etc.)?
The sign on page plus all of its associated resources. There are 27 page
resources. 3 of them (vipIndexPageAnim.gif, vip.js, and !xRefArgsIds.js) are
slow. Here is the Fiddler trace:
# Result URL Body Overall_Elapsed
ResponseSize
1 302 /sdsvip 5
00:00:00.0150009 156
2 200 /sdsvip/ 1,443
00:00:00.0050003 1669
3 200 /sdsvip/index0.html 3,964
00:00:00.0070004 4190
4 200 /sdsvip/ivorybkg.gif 18,659
00:00:00.0100005 18887
5 200 /sdsvip/vipIndexPageAnim.gif 63,007
00:00:06.1323508 63235
6 200 /sdsvip/sdsLogo.120.gif 2,239
00:00:00.0090005 2465
7 200 /sdsvip/ivorybkg.gif 18,659
00:00:00.0100006 18887
8 200 /favicon.ico 2,102
00:00:00.0070004 2303
9 200 /sdsvip/servlets/SDSM0100 6,414
00:00:00.0160009 6691
10 200 /sdsvip/vip.css 1,611
00:00:00.0090005 1836
11 200 /sdsvip/vip.js 50,982
00:00:07.1194072 51216
12 200 /sdsvip/helpVip/_js.js 6,409
00:00:00.0080004 6641
13 200 /sdsvip/spawnControl.js 8,513
00:00:00.0100005 8745
14 304 /sdsvip/ivorybkg.gif 0
00:00:00.0090005 122
15 304 /sdsvip/ivorybkg.gif 0
00:00:00.0090005 122
16 200 /sdsvip/helpVip/!tools.js 34,950
00:00:00.0190011 35184
17 200 /sdsvip/helpVip/_adminParms.js 658
00:00:00.0080005 888
18 200 /sdsvip/helpVip/_userParms.js 257
00:00:00.0080005 487
19 200 /sdsvip/helpVip/!xRefArgsIds.js 54,828
00:00:07.9134526 55062
20 200 /sdsvip/VipSignOnApplet.jar 63,235
00:00:00.0120006 63457
21 200 .net /Root.crl 469
00:00:00.1480085 837
22 200 .net /primobject.crl 460
00:00:00.1270072 828
23 200 .net /ObjectSign.crl 16,253
00:00:00.1470084 16623
24 200 /sdsvip/resources.jar 232,214
00:00:00.0500029 232405
25 200 /sdsvip/commons-codec-1.4.jar 31,883
00:00:00.0080005 32105
26 200 /sdsvip/log4j.jar 154,491
00:00:00.0550031 154714
All but three files are received at the browser well under sub-second. As
previously stated, the jar files, which are pretty big, also are received
sub-second. this is curious to me and may be a clue to amore knowledgeable
person.
Our environment is an IBM mainframe running z/OS. Tomcat runs
under USS (Unix System Services). The JVM version is java version
"1.6.0" Java(TM) SE Runtime Environment (build
pmz3160sr13-20130207_01(SR13)).
When we remove the
protocol="org.apache.coyote.http11.Http11NioProtocol" from the
server.xml, the page loads in about 2 seconds -- the same a tomcat
version 6.0.35.
Is this over SSL or not?
Not SSL.
Does every page-load take 60-seconds or only the first time? What
about other pages?
Initial loads for each page are slow. Once a page element has been cached
by the browser, the page loads instantly (i.e., when the web server
responds with a 304 result code: Not Modified).
So I have narrowed this down to one configuration change. We need
to have NIO enabled, as we use Netty to do some of our IO;
therefore, leaving the option disabled is not possible for us.
I ran Wireshark against 6.0.35 and 6.0.36 with NIO enabled hoping
to see a large discrepancy in the number of packets sent, but the
packet counts were very similar.
I ran Fiddler and did see that files over 50KB in size were the
slow ones; oddly, jar files (we have a swing applet on our sign on
page) that were much larger than the slower .gif and .js files,
were served very quickly.
Are you using compression of any kind? Do you have sendFile enabled?
No compression for basic resources (that is, no compression keywords found
in server.xml). We do have a servlet named ContentType we use for
processing pack200 jar files. This is configured I the web.xml as follows:
<servlet-mapping>
<servlet-name>ContentType</servlet-name>
<url-pattern>*.jar</url-pattern>
</servlet-mapping>
sendFile is not enabled.
Pity. That /would/ have been a clue..
Here is a screencast showing the slow load to give you some context to the
Fiddler trace:
http://screencast.com/t/zmJtsCvgpzTw
Jerry
Are there an APR and a non-APR versions of the NIO Connector ? (I always get confused
about that). If there are, what about switching to the other one ?
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