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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8BIT On Fri, 9 May 2025, Kienan Stewart wrote: > Hi Herman, > > On 5/9/25 6:03 AM, Herman Bruyninckx via lttng-dev wrote: >> Dear all, >> >> I want to trace an array of floats, but I always get bogus output at the >> (Python) Babeltrace2 site... > > could you give an example of the tracepoint you have setup in your code that > doesn't work, with the corresponding output? Thank you for your swift reaction. Much appreaciated. First of all, my apologies: I should have provided the required information the first time around already. --- This is the information about the installed versions of the relevant software: $ uname -a Linux SET-L-ME-P22061 6.11.0-24-generic #24-Ubuntu SMP PREEMPT_DYNAMIC Fri Mar 14 18:13:56 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux $ lttng -V lttng (LTTng Trace Control) 2.13.13 - Nordicité $ babeltrace2 -V Babeltrace 2.0.6 "Amqui" --- --- My application code generates a trace as follows: Tracepoint "-tp.h": LTTNG_UST_TRACEPOINT_EVENT( comm_activity, range_scan, /* Input arguments */ LTTNG_UST_TP_ARGS( int *, distances, ), /* Output event fields */ LTTNG_UST_TP_FIELDS( lttng_ust_field_array(int, distances,distances,5) ) int testmeas[5] = {1, 2, 3, 4, 5}; // double testmeas[5] = {1., 2., 3., 4., 5.}; // (one array for test with integers, one with doubles): lttng_ust_tracepoint(comm_activity,range_scan,5,testmeas, "range_scan"); --- > Could you explain what you mean by (Python) babeltrace2 site? This is the Python code I use to display the trace generated above: (inspired by ) --- file tt.py: import bt2 import sys # Get the trace path from the first command-line argument. path = sys.argv[1] # Create a trace collection message iterator with this path. msg_it = bt2.TraceCollectionMessageIterator(path) # Iterate the trace messages. for msg in msg_it: # `bt2._EventMessageConst` is the Python type of an event message. if type(msg) is bt2._EventMessageConst: # An event message holds a trace event. event = msg.event # Only check `range_scan` events. if event.name != 'comm_activity:range_scan': continue print(event.payload_field) --- and these are the resulting traces (for int and double, respectively, and with the C and Python versions of Babeltrace): $ babeltrace2 ~/git-repositories/communication_5c/build/test_session/ [12:19:11.381152129] (+?.?????????) SET-L-ME-P22061 comm_activity:range_scan: { cpu_id = 6 }, { distances = [ [0] = 1, [1] = 2, [2] = 3, [3] = 4, [4] = 5 ] } $ python3 tt.py ~/git-repositories/communication_5c/build/test_session/ {'distances': [1, 2, 3, 4, 5]} ---- bt2$ babeltrace2 ~/git-repositories/communication_5c/build/test_session/ [10:04:51.068836215] (+?.?????????) SET-L-ME-P22061 comm_activity:range_scan: { cpu_id = 6 }, { distances = [ [0] = 0, [1] = 1072693248, [2] = 0, [3] = 1073741824, [4] = 0 ] } $ python3 tt.py ~/git-repositories/communication_5c/build/test_session/ {'distances': [0, 1072693248, 0, 1073741824, 0]} > Are you instrumenting python code, or are you instrumenting a C/C++ > application with lttng-ust? The latter. >> I have no problems with arrays of integers, though. >> >> Is the float array feature not yet implemented in lttng 2.13? >> Will it be in 2.14? (Also the "BLOB" feature is useful for me.) >> > > I don't see any changes in lttng-ust for 2.14 that allow for tracepoints that > have float arrays or blobs. lttng-modules 2.14 does add support for CTF 2. > The support for CTF 2 in lttng-tools 2.14 will remain at an experimental > level. > > From the release notes: > > CTF 2 output isn't enabled by default and is intended solely for > preview and feedback purposes: having an experimental support will > allow users to test and evaluate CTF 2 until we make it the > default output format. > > >> Thanks for your help. >> >> Herman > > thanks, > kienan Herman > [1]: > https://git.lttng.org/?p=lttng-tools.git;a=blob_plain;f=ChangeLog;hb=11f963148df9597de6d891d96d748bae5ced7149 > > --228850167-1171160360-1746864851=:354512--