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Re: [Discuss-gnuradio] how to change the channel width when data is tran

From: Ritesh Maheshwari
Subject: Re: [Discuss-gnuradio] how to change the channel width when data is transmitting
Date: Fri, 5 Dec 2008 00:18:38 -0500
Hi guys,

Thanks a lot for all the help. Continuing where Jing left (we work in the same team) ...

My installation is on ubuntu 8.10 using the repositories listed on gnuradio website. I am calling benchmark_tx.py with interpolation of 512 and trying to change it every alternate packet to 256. Other details:

>>> gr_fir_fff: using SSE
bits per symbol = 1
Gaussian filter bt = 0.35
Using TX d'board A: Flex 2400 Tx MIMO B
Tx amplitude     12000
modulation:      gmsk_mod
bitrate:         125kb/s
samples/symbol:    2
interp:          512
Tx Frequency:    2.5G
Warning: failed to enable realtime scheduling

The added code is the in the while loop:

        payload = struct.pack('!H', pktno & 0xffff) + data
        #Ritesh
        if pktno % 2 == 0:
                tb.stop()
                if curr_interp == options.interp:
                        curr_interp = (options.interp)/2
                else:
                        curr_interp = options.interp
                tb.wait()
                tb.txpath.u.set_interp_rate(curr_interp)
                tb.start()
                #time.sleep(0.01)
        send_pkt(payload)


Anyways, it looks like if I do not use the wait() call (as suggested by Firas), then either of the following 4 things happen after some packets are transmitted. The number of packets that get transmitted before the program stops is not constant.

-------------------
1. Segmentation fault. The gdb backtrace is here:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb4dd2b90 (LWP 20950)]
0xb66be8ea in fusb_devhandle_linux::_cancel_pending_rqsts () from /usr/lib/libusrp.so.0
(gdb) bt
#0  0xb66be8ea in fusb_devhandle_linux::_cancel_pending_rqsts () from /usr/lib/libusrp.so.0
#1  0xb66bf595 in fusb_ephandle_linux::stop () from /usr/lib/libusrp.so.0
#2  0xb66b28a5 in usrp_basic_tx::stop () from /usr/lib/libusrp.so.0
#3  0xb66bb70d in usrp_standard_tx::stop () from /usr/lib/libusrp.so.0
#4  0xb6676860 in usrp1_sink_base::stop () from /usr/lib/python2.5/site-packages/gnuradio/_usrp1.so
#5  0xb7bbdead in gr_single_threaded_scheduler::main_loop () from /usr/lib/libgnuradio-core.so.0
#6  0xb7bbe83d in gr_single_threaded_scheduler::run () from /usr/lib/libgnuradio-core.so.0
#7  0xb7bbc414 in gr_scheduler_thread::run_undetached () from /usr/lib/libgnuradio-core.so.0
#8  0xb79313fd in omni_thread_wrapper () from /usr/lib/libgromnithread.so.0
#9  0xb7eb450f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#10 0xb7e027ee in clone () from /lib/tls/i686/cmov/libc.so.6

I also sometimes see these statements printed on stdout "fusb: (status -2) No such file or directory", "fusb::pending_remove: failed to find urb in pending_rqsts: 0x94f04f0"

2. One time it crashed without segmentation fault. It printed a huge report which I am attaching in the end of the email.

3. Sometimes it aborts after some failed assertions like:
python: ./gr_buffer.h:96: unsigned int gr_buffer::index_add(unsigned int, unsigned int): Assertion `s < d_bufsize' failed.
OR
python: /usr/include/boost/shared_ptr.hpp:315: T* boost::shared_ptr<T>::operator->() const [with T = gr_message]: Assertion `px != 0' failed.

4. Very few times it goes through fine.

-------------

If I do put the tb.wait() statement, then the program keeps waiting. And gdb trace shows it stuck in the wait() call. Here is the gdb backtrace:

#0  0xb7f2f430 in __kernel_vsyscall ()
#1  0xb7ee2bf7 in pthread_join () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb795ff0d in omni_thread::join () from /usr/lib/libgromnithread.so.0
#3  0xb7bef75e in gr_top_block_impl::wait () from /usr/lib/libgnuradio-core.so.0
#4  0xb7beed10 in gr_top_block::wait () from /usr/lib/libgnuradio-core.so.0
#5  0xb7c74bef in top_block_wait_unlocked ()
   from /usr/lib/python2.5/site-packages/gnuradio/gr/_gnuradio_swig_py_runtime.so
#6  0xb7c7cebd in ?? () from /usr/lib/python2.5/site-packages/gnuradio/gr/_gnuradio_swig_py_runtime.so
#7  0x0805d867 in PyObject_Call ()
#8  0x080cd502 in PyEval_EvalFrameEx ()
#9  0x080d0345 in PyEval_EvalCodeEx ()
#10 0x080ce728 in PyEval_EvalFrameEx ()
#11 0x080cfbf5 in PyEval_EvalFrameEx ()
#12 0x080d0345 in PyEval_EvalCodeEx ()
#13 0x080ce728 in PyEval_EvalFrameEx ()
#14 0x080d0345 in PyEval_EvalCodeEx ()
#15 0x080d0557 in PyEval_EvalCode ()
#16 0x080edf8f in PyRun_FileExFlags ()
#17 0x080ee25a in PyRun_SimpleFileExFlags ()
#18 0x080595e7 in Py_Main ()
#19 0x08058962 in main ()

If I do not change the interpolation rate every alternate packet and instead do it every 4th or 5th packet, then the program seem to go through fine.

Hopefully this info is useful to debug whats going on.

Thanks,
Ritesh

---------------

The report related to #2 above:

*** glibc detected *** python: double free or corruption (fasttop): 0x09fb4f60 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0xb7daa3f4]
/lib/tls/i686/cmov/libc.so.6(cfree+0x96)[0xb7dac456]
/usr/lib/libstdc++.so.6(_ZdlPv+0x21)[0xb7a20031]
/usr/lib/libusrp.so.0(_ZN19fusb_ephandle_linux18completed_list_getEv+0x3c)[0xb66d8b5c]
/usr/lib/libusrp.so.0(_ZN19fusb_ephandle_linux4stopEv+0xa8)[0xb66d95c8]
/usr/lib/libusrp.so.0(_ZN13usrp_basic_tx4stopEv+0x35)[0xb66cc8a5]
/usr/lib/libusrp.so.0(_ZN16usrp_standard_tx4stopEv+0x1d)[0xb66d570d]
/usr/lib/python2.5/site-packages/gnuradio/_usrp1.so(_ZN15usrp1_sink_base4stopEv+0x20)[0xb6690860]
/usr/lib/libgnuradio-core.so.0(_ZN28gr_single_threaded_scheduler9main_loopEv+0x101d)[0xb7bd7ead]
/usr/lib/libgnuradio-core.so.0(_ZN28gr_single_threaded_scheduler3runEv+0x1d)[0xb7bd883d]
/usr/lib/libgnuradio-core.so.0(_ZN19gr_scheduler_thread14run_undetachedEPv+0xa4)[0xb7bd6414]
/usr/lib/libgromnithread.so.0(omni_thread_wrapper+0x7d)[0xb794b3fd]
/lib/tls/i686/cmov/libpthread.so.0[0xb7ece50f]
/lib/tls/i686/cmov/libc.so.6(clone+0x5e)[0xb7e1c7ee]
======= Memory map: ========
08048000-08144000 r-xp 00000000 08:04 744916     /usr/bin/python2.5
08144000-08145000 r--p 000fb000 08:04 744916     /usr/bin/python2.5
08145000-0816a000 rw-p 000fc000 08:04 744916     /usr/bin/python2.5
0816a000-08170000 rw-p 0816a000 00:00 0
09817000-0a26a000 rw-p 09817000 00:00 0          [heap]
a4bf3000-a4bf4000 ---p a4bf3000 00:00 0
a4bf4000-a53f4000 rw-p a4bf4000 00:00 0
a53f4000-a53f5000 ---p a53f4000 00:00 0
a53f5000-a5bf5000 rw-p a53f5000 00:00 0
a5bf5000-a5bf6000 ---p a5bf5000 00:00 0
a5bf6000-a63f6000 rw-p a5bf6000 00:00 0
a63f6000-a63f7000 ---p a63f6000 00:00 0
a63f7000-a6bf7000 rw-p a63f7000 00:00 0
a6bf7000-a6bf8000 ---p a6bf7000 00:00 0
a6bf8000-a73f8000 rw-p a6bf8000 00:00 0
a73f8000-a73f9000 ---p a73f8000 00:00 0
a73f9000-a7bf9000 rw-p a73f9000 00:00 0
a7bf9000-a7bfa000 ---p a7bf9000 00:00 0
a7bfa000-a83fa000 rw-p a7bfa000 00:00 0
a83fa000-a83fb000 ---p a83fa000 00:00 0
a83fb000-a8bfb000 rw-p a83fb000 00:00 0
a8bfb000-a8bfc000 ---p a8bfb000 00:00 0
a8bfc000-a93fc000 rw-p a8bfc000 00:00 0
a93fc000-a93fd000 ---p a93fc000 00:00 0
a93fd000-a9bfd000 rw-p a93fd000 00:00 0
a9bfd000-a9bfe000 ---p a9bfd000 00:00 0
a9bfe000-aa3fe000 rw-p a9bfe000 00:00 0
aa3fe000-aa3ff000 ---p aa3fe000 00:00 0
aa3ff000-aabff000 rw-p aa3ff000 00:00 0
aabff000-aac00000 ---p aabff000 00:00 0
aac00000-ab400000 rw-p aac00000 00:00 0
ab400000-ab421000 rw-p ab400000 00:00 0
ab421000-ab500000 ---p ab421000 00:00 0
ab5da000-ab5db000 ---p ab5da000 00:00 0
ab5db000-abddb000 rw-p ab5db000 00:00 0
abddb000-abddc000 ---p abddb000 00:00 0
abddc000-ac5dc000 rw-p abddc000 00:00 0
ac5dc000-ac5dd000 ---p ac5dc000 00:00 0
ac5dd000-acddd000 rw-p ac5dd000 00:00 0
acddd000-acdde000 ---p acddd000 00:00 0
acdde000-ad5de000 rw-p acdde000 00:00 0
ad5de000-ad5df000 ---p ad5de000 00:00 0
ad5df000-adddf000 rw-p ad5df000 00:00 0
adddf000-adde0000 ---p adddf000 00:00 0
adde0000-ae5e0000 rw-p adde0000 00:00 0
ae5e0000-ae5e1000 ---p ae5e0000 00:00 0
ae5e1000-aede1000 rw-p ae5e1000 00:00 0
aede1000-aede2000 ---p aede1000 00:00 0
aede2000-af5e2000 rw-p aede2000 00:00 0
af5e2000-af5e3000 ---p af5e2000 00:00 0
af5e3000-afde3000 rw-p af5e3000 00:00 0
afde3000-afde4000 ---p afde3000 00:00 0
afde4000-b05e4000 rw-p afde4000 00:00 0
b05e4000-b05e5000 ---p b05e4000 00:00 0
b05e5000-b0de5000 rw-p b05e5000 00:00 0
b0de5000-b0de6000 ---p b0de5000 00:00 0
b0de6000-b15e6000 rw-p b0de6000 00:00 0
b15e6000-b15e7000 ---p b15e6000 00:00 0
b15e7000-b1de7000 rw-p b15e7000 00:00 0
b1de7000-b1de8000 ---p b1de7000 00:00 0
b1de8000-b25e8000 rw-p b1de8000 00:00 0
b25e8000-b25e9000 ---p b25e8000 00:00 0
b25e9000-b2de9000 rw-p b25e9000 00:00 0
b2de9000-b2dea000 ---p b2de9000 00:00 0
b2dea000-b35ea000 rw-p b2dea000 00:00 0
b35ea000-b35eb000 ---p b35ea000 00:00 0
b35eb000-b3deb000 rw-p b35eb000 00:00 0
b3deb000-b3dec000 ---p b3deb000 00:00 0
b3dec000-b45ec000 rw-p b3dec000 00:00 0
b45ec000-b45ed000 ---p b45ec000 00:00 0
b45ed000-b4ded000 rw-p b45ed000 00:00 0
b4ded000-b4dee000 ---p b4ded000 00:00 0
b4dee000-b55ee000 rw-p b4dee000 00:00 0
b55ee000-b55ef000 ---p b55ee000 00:00 0
b55ef000-b5def000 rw-p b55ef000 00:00 0
b5def000-b5df0000 r--s 00000000 00:09 964034594  /SYSV00000000 (deleted)
b5df0000-b5df8000 rw-s 00000000 00:09 964100139  /SYSV00000000 (deleted)
b5df8000-b5e00000 rw-s 00000000 00:09 964100139  /SYSV00000000 (deleted)
b5e00000-b5e01000 r--s 00000000 00:09 964034594  /SYSV00000000 (deleted)
b5e01000-b5e02000 r--s 00000000 00:09 964132899  /SYSV00000000 (deleted)
b5e02000-b5e0a000 rw-s 00000000 00:09 964198441  /SYSV00000000 (deleted)
b5e0a000-b5e12000 rw-s 00000000 00:09 964198441  /SYSV00000000 (deleted)
b5e12000-b5e13000 r--s 00000000 00:09 964132899  /SYSV00000000 (deleted)
b5e13000-b5e14000 ---p b5e13000 00:00 0
b5e14000-b6614000 rw-p b5e14000 00:00 0
b6614000-b6615000 r--s 00000000 00:09 963837985  /SYSV00000000 (deleted)
b6615000-b661d000 rw-s 00000000 00:09 963903528  /SYSV00000000 (deleted)
b661d000-b6625000 rw-s 00000000 00:09 963903528  /SYSV00000000 (deleted)
b6625000-b6626000 r--s 00000000 00:09 963837985  /SYSV00000000 (deleted)
b664a000-b664b000 r--s 00000000 00:09 963739678  /SYSV00000000 (deleted)
b664b000-b6653000 rw-s 00000000 00:09 963805221  /SYSV00000000 (deleted)
b6653000-b665b000 rw-s 00000000 00:09 963805221  /SYSV00000000 (deleted)
b665b000-b665c000 r--s 00000000 00:09 963739678  /SYSV00000000 (deleted)
b665c000-b66b9000 r-xp 00000000 08:04 1297014    /usr/lib/python2.5/site-packages/gnuradio/_usrp1.so
b66b9000-b66bc000 rw-p 0005d000 08:04 1297014    /usr/lib/python2.5/site-packages/gnuradio/_usrp1.so
b66bc000-b66c2000 r-xp 00000000 08:04 980134     /lib/libusb-0.1.so.4.4.4
b66c2000-b66c3000 r--p 00005000 08:04 980134     /lib/libusb-0.1.so.4.4.4
b66c3000-b66c5000 rw-p 00006000 08:04 980134     /lib/libusb-0.1.so.4.4.4
b66c5000-b66e0000 r-xp 00000000 08:04 750555     /usr/lib/libusrp.so.0.0.0
b66e0000-b66e1000 rw-p 0001b000 08:04 750555     /usr/lib/libusrp.so.0.0.0
b66e8000-b66e9000 r--s 00000000 00:09 963936285  /SYSV00000000 (deleted)
b66e9000-b66f1000 rw-s 00000000 00:09 964001831  /SYSV00000000 (deleted)
b66f1000-b66f9000 rw-s 00000000 00:09 964001831  /SYSV00000000 (deleted)
b66f9000-b66fa000 r--s 00000000 00:09 963936285  /SYSV00000000 (deleted)
b66fa000-b66fd000 r-xp 00000000 08:04 876068     /usr/lib/python2.5/lib-dynload/cmath.so
b66fd000-b66fe000 r--p 00002000 08:04 876068     /usr/lib/python2.5/lib-dynload/cmath.so
b66fe000-b66ff000 rw-p 00003000 08:04 876068     /usr/lib/python2.5/lib-dynload/cmath.so
b66ff000-b6710000 r-xp 00000000 08:04 1296987    /usr/lib/python2.5/site-packages/usrpm/_usrp_prims.so
b6710000-b6711000 rw-p 00011000 08:04 1296987    /usr/lib/python2.5/site-packages/usrpm/_usrp_prims.so
b6711000-b6742000 r-xp 00000000 08:04 980182     /usr/lib/python2.5/site-packages/numpy/random/mtrand.so
b6742000-b6743000 r--p 00030000 08:04 980182     /usr/lib/python2.5/site-packages/numpy/random/mtrand.so
b6743000-b6747000 rw-p 00031000 08:04 980182     /usr/lib/python2.5/site-packages/numpy/random/mtrand.so
b6747000-b6d7b000 r-xp 00000000 08:04 746411     /usr/lib/liblapack.so.3gf.0
b6d7b000-b6d7c000 r--p 00633000 08:04 746411     /usr/lib/liblapack.so.3gf.0
b6d7c000-b6d7f000 rw-p 00634000 08:04 746411     /usr/lib/liblapack.so.3gf.0
b6d7f000-b6e8c000 rw-p b6d7f000 00:00 0
b6e8e000-b6e91000 r-xp 00000000 08:04 876077     /usr/lib/python2.5/lib-dynload/_locale.so
b6e91000-b6e92000 r--p 00002000 08:04 876077     /usr/lib/python2.5/lib-dynload/_locale.so
b6e92000-b6e93000 rw-p 00003000 08:04 876077     /usr/lib/python2.5/lib-dynload/_locale.so
b6e93000-b6ea7000 r-xp 00000000 08:04 876065     /usr/lib/python2.5/lib-dynload/_ctypes.so
b6ea7000-b6ea8000 r--p 00014000 08:04 876065     /usr/lib/python2.5/lib-dynload/_ctypes.so
b6ea8000-b6eaa000 rw-p 00015000 08:04 876065     /usr/lib/python2.5/lib-dynload/_ctypes.so
b6eaa000-b6eb9000 r-xp 00000000 08:04 971614     /lib/libbz2.so.1.0.4
b6eb9000-b6eba000 r--p 0000f000 08:04 971614     /lib/libbz2.so.1.0.4
b6eba000-b6ebb000 rw-p 00010000 08:04 971614     /lib/libbz2.so.1.0.4
b6ebb000-b6Aborted

On Tue, Nov 18, 2008 at 3:20 PM, cao jing <address@hidden> wrote:
I changed my code in benchmark_tx.py as follow. But the program
blocked at the tb.wait().

tb.start() // this is the first time
tb.stop()
tb.wait() // block here
self.u.set_inter_rate(xxx)
tb.start()

On Tue, Nov 18, 2008 at 11:14 AM, Firas A. <address@hidden> wrote:
>
> Hi,
>
> If tb is your topblock, you can try the following :
>
> tb.stop()
> tb.wait()
> self.u.set_inter_rate(xxx)
> tb.start()
>
>
> Don't forget to give us a feed back.
>
>
> Best Regards,
>
>
> Firas
>
> --
> View this message in context: http://www.nabble.com/how-to-change-the-channel-width-when-data-is-transmitting-tp20471587p20562715.html
> Sent from the GnuRadio mailing list archive at Nabble.com.
>
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>


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