[Yum-devel] [PATCH] Delta and global FileRequires Resolving

[Terje Røsten]

Florian Festi
> On my PC "echo n |yum update" is now appr. 100% faster when trying
> to update 60 pkgs. Larger and more complicated cases or packages with 
> lots of files may gain even more.
>
I get 4:30 and 19:15, for 63 packages in 114 MB. Better, but not there 
yet...

BTW:

Can someone explain how the new depsolver works?

Take this example:

 * Upgrading glibc from  2.5.90-19 to glibc-2.5.90-17

The diff on output from rpm -ql --provides glibc is:

--- /tmp/old.log        2007-03-20 20:33:58.000000000 +0100
+++ /tmp/new.log        2007-03-20 20:33:45.000000000 +0100
@@ -232,7 +232,7 @@
 UTF-32.so 
 UTF-7.so 
 VISCII.so 
-config(glibc) = 2.5.90-17
+config(glibc) = 2.5.90-19
 ld-linux.so.2 
 ld-linux.so.2(GLIBC_2.0) 
 ld-linux.so.2(GLIBC_2.1) 
@@ -322,7 +322,7 @@
 libutil.so.1 
 libutil.so.1(GLIBC_2.0) 
 rtld(GNU_HASH) 
-glibc = 2.5.90-17
+glibc = 2.5.90-19
 /etc/ld.so.conf
 /etc/ld.so.conf.d
 /etc/localtime

Ok, almost nothing is changed =>
if old glibc is good, then the new glibc is good too, no need to check 
anything, just
do the upgrade.

However, look at this:

# python yummain.py -d100 -e100 install glibc | tee /tmp/yum.log

# grep -c 'looking at' /tmp/glibc.log
38595

# grep -c 'looking to see what requires' /tmp/glibc.log
20974

60000 checks!

How can this be needed?

 - Terje