Teledyne LeCroy SAS Suite User Manual - Manual (Page 58)

Version 6.25 SASSuite User Manual
48
LeCroy Corporation
Save As
Multi-
segment
Trace
This option causes the analyzer
to segment the trace into
multiple files and create an
index file called data.mlt that summarizes the starting and finishing frame for each
segment.
This option is useful for very large recordings and for host PCs with limited memory. In
the latter case, multi-segmenting gives a PC with limited memory a way to open
recordings that would otherwise be too large to open.
The only downside to multi-segmenting is that it limits the scope of reports such as Traffic
Summary, Bus Utilization, and Error Summary to each of the segments. You will not be
able to perform summary statistics on the full recording.
The default value for this option is 10 MB. Before attempting large recordings, it is
recommended that you adjust this number to see what value best suits your needs.
based on the capabilities of your host PC.
To create a multisegmented trace,
Step 1 Check the box marked Save As Multisegmented Trace.
Step 2 Set the file size for each segment in the box marked MB Segments.
File Structure for Segmented Files
Multisegmenting produces an index file and subordinate trace files. The default name of
the index file is dataXYZ.smt, where XYZ is the last three digits of the analyzer’s serial
number. (You can see the unit’s serial number by selecting Help > About SASSuite)
Thus, for example, if you had an analyzer with the serial number 111, the index file would
be called data111.smt.
The index file and the segmented trace files are stored in a directory named after the
index file. The directory is named indexfilename_smt_files. For example, if the index
file is named data111.smt, the directory will be named data111_smt_files. Below this
directory additional, sequentially numbered sub-directories (up to 100,000) that house
the segmented trace files. These sub-directories bear simple numerical names: 00000 -
00999. Each of these subdirectories can hold up to 100 sequentially-numbered segment
files. Collectively, the entire directory structure can hold up to 10 million files.
Example
A 1010 MB recording using 10 MB segments and the default file names will create the
following sub-directories and files. The example below uses the serial number 111:
•
data111.smt This is the index file.
•
data111_smt_files\00000\segment_00000.sas
•
data111_smt_files\00000\segment_00001.sas
...
• data111_smt_files\00000\segment_00099.sas
•
data111_smt_files\00001\segment_00100.sas
•
data111_smt_files\00001\segment_00101.sas