Midas vs. DXL: When performance matters
Thu 29 Sep 2005, 09:55 AMTweet
by Ben Langhinrichs
I am writing codes to generate a NotesDocument with a tailor-made table(diff cell color, merged cell) by DXL.
If you really want performance and control over rich text at the same time, DXL isn't going to work well for you, and neither will the native LS rich text classes. Both are just way too slow. If you need performance, you either need an API solution, which will be pretty complex to write, or a third party product such as our Midas Rich Text LSX, which combines high levels of flexibility with extremely high performance.
Table created in one call
Table created a row at a time
Copyright © 2005 Genii Software Ltd.
What has been said:
373.1. Stan Rogers (09/29/2005 07:57 PM)
Actually, it's about half a second plus the import time (derived by creating a deliberate illegal child element early in a test document to make validation fail on import, then removing the illegal element nd testing again). I've done some pretty complex rich text stuff in DXL, and I was really surprised by the times given in that posting -- I create a newsletter by getting document text from a CMS database, formatting using user-defined stylesheets in another location for consistency, import pictures, and place everything into a user-defined newsletter template, and all of that happens in well under two seconds. At first, I thought that there had to be something wrong with the poster's code, so I thought I'd do a quick test to confirm and then tell him so.
The NotesDXLImporter really, really doesn't like big tables -- the import time is just about proportional to the number of table cells, as far as I can tell. The current template for my newsletter is not exactly simple, but it's only a five-by-six table nested in a four-by-two table, so there aren't that many table cells involved altogether. I suspect that things are being checked, double-checked, QA'd, signed off, voted upon, and then checked again before the document(s) are actually created. Not that DXL is ever going to be as quick as Midas (or even nearly so), but big tables hitting the DXL importer seems to be the bottleneck.
373.2. Ben Langhinrichs (09/29/2005 08:11 PM)
Well, to be fair, everything about big tables is slow in Notes. Just opening a document with a big table is slow in Notes, and I have spent enormous amounts of time tuning Midas to try to make table manipulation faster. Partly, I do caching of the CD record stream, because the subsequent rows are what kill the process. If I turn off caching in Midas, the number goes to 34 seconds for 100 documents, even with all the other tuned code.
I guess the point to remember too is that there are basically two ways people use tables. They are either working on a single document at a time, in which case anything under a second is probably "fast enough", or they are working on lots of documents, in which case the faster the better. Even at 2 seconds, the amount of time to do a whole load of processing (like the example I mentioned in my post) just shoots up. On modern computers, we are used to processing tens to hundreds of documents a second. For example, on our Midas LSX page, I cite the example of HTML generation by Midas at 900 documents a second. That is really, really fast, but send it off to do a million documents and it still takes almost twenty minutes. Imagine if you had times even at half a second per document. A million document process would take close to a week! Even 100,000 documents would take all day. It is the big batch jobs where performance is really key. For single documents where you don't have really big tables, DXL is plenty fast enough.
373.3. Ben Langhinrichs (09/29/2005 11:22 PM)
Just a try