June 2002 - Zope - Zope lists

ZPatterns on OS X
by Victor Ng 04 Jun '02

04 Jun '02

Has anyone managed to build ZPatterns under OS X 10.1.4? I'm coming from a Debian Linux background so apt-get has spoiled me and I can't figure out how to get the makefile working properly. Vic

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Zope Certification
by José Orlando Ribeiro 04 Jun '02

04 Jun '02

I saw we have it , in Zope Corp site, but there's no informatio about how to be certified and etc.

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CMF Complex Document errors
by eric.n.dunn＠bankofamerica.com 04 Jun '02

04 Jun '02

Running Zope 2.5 on Debian box w/ CMF 1.2 Can I fix this... if so how? CMF ComplexDocument 0.1b3: Traceback (most recent call last): File "/local/zope-2.5/lib/python/OFS/Application.py", line 531, in import_product product=__import__(pname, global_dict, global_dict, silly) File "/local/zope/lib/python/Products/CMFComplexDocument/__init__.py", line 9, in ? import ComplexDocument File "/local/zope/lib/python/Products/CMFComplexDocument/ComplexDocument.py", line 20, in ? from Products.CMFCore.WorkflowCore import WorkflowAction, afterCreate ImportError: cannot import name afterCreate Thanks Eric

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RE: [Zope] system requirements
by sean.upton＠uniontrib.com 04 Jun '02

04 Jun '02

I'm deploying a new (eventually to be very-heavily loaded) ZEO storage server on a DP Xeon/Prestonia box (running Linux 2.4.18 compiled from source from a RedHat Errata kernel source RPM with low latency scheduling enabled); the box has hardware-multi-threading capabilities; ZEO will be serving what I anticipate will be a FileStorage storage of several gigabytes sitting on a 8-spindle RAID 10. All ZEO traffic will be coming from networked ZEO clients on a Copper-GB network. One of the thoughts that I had was that it seemed at least theoretically possible that if the box is very loaded, that the HMT would help in terms of using spare CPU cycles in handling interrupts from the GB NIC and RAID Controller, but I worry that enabling HMT will compromise Python performance. Any thoughts on whether HMT/HyperThreading will help or hinder ZEO performance given Python's GIL? Could I get an accurate picture of any degradation by simply running pystone tests with HyperThreading disabled and enabled? In comparing kernel source, it looks that, unlike the stock kernel, RedHat's 2.4.18-4 kernel source has a reworked kernel/sched.c that has set_cpus_allowed() call, which should, in theory, prevent migration of a task from a CPU. Has anyone tried this with Python? Sean -----Original Message----- From: Matthew T. Kromer [mailto:matt@zope.com] Sent: Tuesday, May 28, 2002 9:16 AM To: Dennis Allison Cc: Tom Nixon; zope(a)zope.org Subject: Re: [Zope] system requirements Dennis Allison wrote: >I'm about to put together a production machine as well and so have been >thinking about the issues and cost/performance trade-offs. Comments on >hidden gotchas would be particularly welcome. Have there been problems >with dual processor Linuz systems and ZServer? > >Software: Zope 2.5.X and CMF 1.3, ZServer + Squid No Apache -- this >will be a dedicated Zope system. RH 7.2 with lots of cruft removed. >MySQL. > >Hardware: Dual AMD Athlon processors (2+ GHz) > Tyan motherboard with 760 chipset? > 1GB DDR memory with ECC. (2GB if budget allows) > 10/100 Ethernet > CDROM (for loading...) > Floppy (for bootloading/rescue) > 40 GB+ disk (probably IDE) > SCSI > Display controller (for configuration) > 2U rackmount box with big fans > >On Tue, 28 May 2002, Matthew T. Kromer wrote: > > I do *not* recommend running Zope on multiprocessor machines without an ability to restrict Zope to execution on a single CPU. The reason for this is that the Python Global Interpreter Lock is shared inside a Zope process. However, threads in Python are backed by underlying OS threads. Thus, Zope will create multiple threads, and each thread is likely to be assigned to a different CPU by the OS scheduler. However, all CPUs but one which are dispatching any given Zope process will have to then wait and attempt to acquire the GIL; this process introduces significant latency into Python and thus into Zope. Linux has no native mechanism for processor binding. In fact, there is a CPU dispatch mask for processes, but there is no facility to set the mask that I know of. Solaris can use a system command like 'pbind' to bind a process to a particular CPU. If you *do* go with a multiprocessor, be sure and tune the os.setcheckinterval() call made by z2.py. I think it should be roughly your pystone number divided by 50. This will set the coarse scheduler granularity of Python so that it doesn't attempt to move the lock as often. This will allow Zope to do as much work as it can without injecting latencies shuffling the GIL off between threads on other CPUs. In fact, setting os.setcheckinterval() to pystones/50 is probably a good idea regardless of what platform you are on. The current default is 120, which is better than the Python default of 10 -- but still means there is a lot of unnecessary lock shuffling on fast CPUs (the number 120 was reasonable 2 years ago, but isn't now -- an Athlon XP 2000+ should probably have a number of about 500). The basic idea is to allow some particular time quanta to expire before moving the lock -- but the counter is expressed in python bytecode ops. As CPUs get faster, the quanta is shrinking, rather than remaining constant -- or in other words, overhead is growing linearly with CPU speed improvements unless you make this tuning change. -- Matt Kromer Zope Corporation http://www.zope.com/ _______________________________________________ Zope maillist - Zope(a)zope.org http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )

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RE: [Zope] How do reset a dtml-var
by McDonnell, Larry 04 Jun '02

04 Jun '02

Hi, Thanks for the quick responses, Scott this works great thanks again. -----Original Message----- From: Meilicke, Scott [mailto:scott.meilicke@intp.com] Sent: Monday, June 03, 2002 1:11 PM To: McDonnell, Larry; 'Zope@Zope. Org' (E-mail) Subject: RE: [Zope] How do reset a dtml-var variables set by dtml-let are only in the namespace in between the dtml-let tags. When you close the tag, the variables are removed. If you can't use dtml-let tags, you can push the variable into REQUEST with: (not tested) <dtml-call "REQUEST.set('revision','%')"> -Scott -----Original Message----- From: McDonnell, Larry [ mailto:lmcdonnell@protonenergy.com <mailto:lmcdonnell@protonenergy.com> ] Sent: Monday, June 03, 2002 9:57 AM To: 'Zope@Zope. Org' (E-mail) Subject: [Zope] How do reset a dtml-var Hi, I am trying to check to see if the dtml-var revision is set to a null and if it is I want to set it to "%" as a sql wildcard. This is my test. <dtml-if expr="revision==''"> <dtml-var revision>test if1 <dtml-let revision="'%'"> <dtml-var revision>test if2 </dtml-let> <dtml-var revision>test if3 </dtml-if> Here are my results. test if1 %test if2 test if3 How come the variable is not set after I leave dtml-let statement? Thanks. Larry McDonnell Proton Energy Systems 50 Inwood Rd. Rocky Hill, CT 06067 (860) 571-6533 ext. 531 Email:lmcdonnell@protonenergy.com www.protonenergy.com _______________________________________________ Zope maillist - Zope(a)zope.org http://lists.zope.org/mailman/listinfo/zope <http://lists.zope.org/mailman/listinfo/zope> ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce <http://lists.zope.org/mailman/listinfo/zope-announce> http://lists.zope.org/mailman/listinfo/zope-dev <http://lists.zope.org/mailman/listinfo/zope-dev> ) The information contained in this email message may be privileged and is confidential information intended only for the use of the recipient or any employee or agent responsible for delivering it to the intended recipient. Any unauthorized use, distribution or copying of this information is strictly prohibited and may be unlawful. If you have received this communication in error, please notify the sender immediately and destroy the original message and all attachments from your electronic files.

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When will Python 2.2 be supported?
by Hamish Lawson 04 Jun '02

04 Jun '02

I couldn't find any mention in the Zope 2.6 plan of support for Python 2.2. In what version of Zope might we expect to see that? Hamish Lawson

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ExternalEditor and Cookie Authentification
by Harald Koschinski 04 Jun '02

04 Jun '02

Hi, does anybody know how to get ExternalEditor working with CookieCrumbler? In the file uploaded to the Editor is a first line with the Cookies and it impossible to save the file. ---------------------------------------- cookie:dtpref_rows="28"; dtpref_cols="50"; __ac_name="koschinh"; __ac="a29zY2hpbmg6Zmlua2VuMQ%3D%3D%0A"; tree-s="eJyLjlZ3hANPW3UdhWhkkUhb9VggAAC9GAn5" <html> ..... ------------------------------------------ regards Harald

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Re: [Zope] personalize Home Page
by eric.n.dunn＠bankofamerica.com 04 Jun '02

04 Jun '02

This is what I use to pull the last 3 dates from my squishdot site (without stuff in parens) <dtml-with expr="squishdot_site"> (squishdot folderish/object) <dtml-var articles_html> (copied code from "squishdot/rightbox_methods/prev_articles) </dtml-with> (close tag) Same concept with my CMF site <dtml-with expr="CMF"> <dtml-var cmf_news> </dtml-with> I pull both CMF News and Squishdot News to my front page. Anyone posting to my CMF or Squishdot site will see there posting headline on the fron page. "Santagostino Pretina, Luca" <lsantagostino(a)activa3.net> on 06/04/2002 06:35:31 AM To: "'zope(a)zope.org'" <zope(a)zope.org> cc: Subject: [Zope] personalize Home Page Hi list, I am new to Zope and I am stuck with this problem: I have created folders and subfolders and I now need to retrieve the content of these subfolders and display it in the home page. Let's say I have 4 different folders, each one has 3 subfolders and each subfolder has a list of articles or news_items. How can I import the content of the last article published in a specified subfolders, in the homepage? or the last news_item published in a specified subfolder into the index_html of the homepage? thanks for helping Luca _______________________________________________ Zope maillist - Zope(a)zope.org http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )

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DTML-less tutorials for product building?
by Victor Ng 04 Jun '02

04 Jun '02

Can someone suggest any tutorials that focus on non-trivial product/application development using only TAL/TALES, CMF and Python Scripts? DTML seems like a bad hack and from lurking on the mailing lists it seems like it's going to become a deprecated technology anyway. Vic

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Major Problems
by brian.r.brinegar.1 04 Jun '02

04 Jun '02

It's 6:33 am on Tuesday and the cluster is acting very strange. Actually it seems to be having problems similar to those we had when the load balancing was not working. Accept it seems to sending out completely random objects for each request. -Brian

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