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.
Here is a screencast showing the slow load to give you some context to the
Fiddler trace:
http://screencast.com/t/zmJtsCvgpzTw
Jerry
>
> - -chris
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> =29Jo
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