TT CME Gateway System Administration Manual - Trading ...

4 Configuring Market Data
Enabling Subjects in
HostInfo.cfg
TT CME Gateway System Administration Manual 71
Trading Technologies International, Inc.
Note: As a reminder, the channel limit is in place to ensure Gateway performance.
Internal testing at TT has shown that, for extremely performance-sensitive customers, the
number of channels enabled on the TT CME Gateway should be kept well below the 14
channel maximum. Please work with your local TAM to determine the optimal configuration
based on your trading style and volume.
Channel Volume
When optimizing Gateway performance, the level of activity on each channel also
needs to be considered. Currently, the following channels experience the most
volume, so TT strongly recommends not combining these channels on a single
gateway:
• Channel 9: CME Globex Interest Rate Futures (*_IR_FUTURES)
• Channel 30: NYMEX Crude Futures (*_OIL_GASOLINE_IPORT)
Note: The recommendations in this section are based on testing results and historical
subscription data. Please work with your local TAM to determine the optimal configuration
based on your trading style and volume.
Warning: If the TT CME Gateway subscribes to more than 14 FIX/FAST channels,
the Price Server logs an error message and displays as Exchange Feed Down (half
red, half green) in Guardian. If this occurs, you will need to adjust the number of
subject parameters enabled in the [price_session] section in hostinfo.cfg and
restart the Price Server.
A sample error message is shown in the following example (where “Y” equals the
number of channels currently enabled on the TT CME Gateway):
Example:
| INFO | 00000000 | price_session | Price Server Shutting Down:
| INFO | 00000000 | price_session | For performance concerns the Price
Server cannot load more than 14 channels.
| INFO | 00000000 | price_session | Y channels were enabled in
hostinfo.cfg.
To enable subjects in the hostinfo.cfg file
1. In Windows Explorer, navigate to :\tt\config.
2. Using Notepad, open the hostinfo.cfg file.
3. In the [price_session] section, enable or add each FASTSubject parameter:
• To subscribe to a FIX/FAST channel, remove the # sign from in front of the
corresponding FASTSubject parameter.
• When adding a FASTSubject parameter, the parameter number must be
incremented by “1” (e.g., if the last FASTSubject parameter is
FASTSubject17=, you should add the next line as
FASTSubject18=).
• Ensure each parameter is on its own line in the [price_session] section
• Review the updated FASTSubject list and ensure that the value of ‘#’ in
each FASTSubject#= parameter is sequential and does not contain a
duplicate number.
4. On the File menu, click Save.