May 2002 - Zope - Zope lists

Re: [Zope] system requirements
by Matt Hamilton 04 Jun '02

04 Jun '02

> 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. [...] > Matt, What does the GIL actually do? What actions within the interpreter require the GIL? -Matt -- Matt Hamilton matth(a)netsight.co.uk Netsight Internet Solutions, Ltd. Business Vision on the Internet http://www.netsight.co.uk +44 (0)117 9090901 Web Hosting | Web Design | Domain Names | Co-location | DB Integration

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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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ZOPE & SSL
by Frank Peavy 03 Jun '02

03 Jun '02

Does the Zope webserver have SSL built in? Can I have secured transactions with Zope? How is that achieved?

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How to get rid of header and footer information?
by Lorenz Lorenz-Meyer 03 Jun '02

03 Jun '02

Hi, I ran into the following problem with Zope: If you create a Zope document you will probably include something like <dtml-var standard_whatever_header> and <dtml-var standard_whatever_footer> into the main text area, thereby giving layout information for the default rendering of the item. Problem is, when you try to access the main content of the document, say, for non-default purposes like a text-only version or inclusion into some digest, you always get this default layout information too - if you want it or not. So I have two related questions: 1. Is it possible to reference the main content area of a document EXCLUDING the header and footer information, just like a 'clean' property field? 2. Is there a better way than including Headers and Footers, maybe by relating a document somehow with different separate 'template'-like dtml-methods for default and non-standard ways of rendering the document? Sorry, if this is a stupid newbie question, and thanks in advance, Lorenz. ________________________________________________________ Dr. Lorenz Lorenz-Meyer Holstenring 2 22763 Hamburg E-Mail: lorenz(a)clubvolt.de Tel: +49 40 5259 5551 AIM: lorenzlm Mobil: +49 179 139 5819 ________________________________________________________

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Catch Unauthorized exception and internal redirect to login DTML doc
by David K. Trudgett 02 Jun '02

02 Jun '02

I'm using exUserFolder to do cookie-based authentication. When a resource is accessed without authentication, an Unauthorized exception is generated. At present, I have a couple of lines in standard_html_header that do an HTTP redirect to the login form: <META HTTP-EQUIV=Expires CONTENT="<dtml-var "ZopeTime()-1" fmt="%Y-%m-%d">"> <META HTTP-EQUIV=Refresh CONTENT="0; URL=&dtml-URL1;/acl_users/redirectToLogin?destination=&dtml-URL;<dtml-if "REQUEST.has_key('authFailedCode')">&authFailedCode=&dtml-authFailedCode;</dtml-if>"> This does a browser redirect to the login form, but not before the visitor sees the error page. How can I get Zope to do an internal redirect to my login form when an Unauthorized exception is generated? Thanks for any tips or pointers! David Trudgett

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Hosting ZOPE
by Frank Peavy 02 Jun '02

02 Jun '02

I have only seen one service that will host Zope. Can someone recommend others, so I have some choice? Are can I use any hosting service that allows me to upload my site?

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Is Zope 3 being developed for programmers only?
by Jan Smith 02 Jun '02

02 Jun '02

I have recently been looking at Zope Page Templates with a view to switching over to them in preparation for Zope 3. However as I understand it people are encouraged to use Python rather than DTML when using TAL. TAL is not a replacement for DTML so what is the future for people who really like Zope and have DTML experience but not Python experience? Jan Smith WebMster OzZope http://www.ozzope.org

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Adding ZPT in __init__ method
by Nico de Boer 02 Jun '02

02 Jun '02

Hello, I want to add a ZPT at initialization (in the __init__ method) of my folderish product. Why can't I just use: self.manage_addPageTemplate(id='ZPTid',title='title',text='content') Can someone give me the right syntax to do this? I've tried the following, but aq_parent doesn't exists at initialization of your product (thanks Casey): parent = getattr(self, 'aq_parent', None) self._createZPT(parent, 'ZPTidentity', 'title', 'Template') def _createZPT(self, parent, id, title, content): """Add a PageTemplate to the News product""" parent._setObject(id, ZopePageTemplate.ZopePageTemplate(id, text=content)) getattr(parent, id).pt_setTitle(title) Greetz Nico

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