# Connecting an output to multiple input **URL:** \ **Category:** GNU Radio\ **Created:** [October 12, 2014, 6:03pm UTC](https://www.ruby-forum.com/t/connecting-an-output-to-multiple-input/232491 "2014-10-12T18:03:03Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Post date:** [October 12, 2014, 6:03pm UTC](https://www.ruby-forum.com/t/connecting-an-output-to-multiple-input/232491/1 "2014-10-12T18:03:03Z")
Hello GNURadioers! I have a block (blck #1) connected to multiple of blocks. Here I have two blocks’ (call blck #2 and blck #3) connected to blck #1 output. I’m confused when I saw nitems\_read of blck #2 and #3 aren’t the same, say 1000 items are read by blck #2 and 155000 items read by blck #3 after sometimes. I know the processing chain of blck #2 and blck #3 is so different which causes a low rate of reading items by blck #2 rather than blck #3 can read so faster. My question is why? why is this happening? Both of blck #2 & 3 are reading from one output port? Any idea? Best, Mostafa ---
**Author:** ![mostafa\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/5e9695/32.png) [@mostafa\_a](https://www.ruby-forum.com/u/mostafa_a)\ **Post date:** [October 12, 2014, 10:32pm UTC](https://www.ruby-forum.com/t/connecting-an-output-to-multiple-input/232491/2 "2014-10-12T22:32:53Z")
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Mostafa, it’s like you understand: It’s the same output buffer, but each consumer (== block2 and 3) have their own buffer readers that keep track of how many samples they consumed. Block 1 can only overwrite parts of the buffer that _both_ readers have already consumed. Greetings, Marcus On 12.10.2014 18:01, Mostafa A. wrote: > blck #2 rather than blck #3 can read so faster. > \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ Discuss-gnuradio > mailing list [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAEBAgAGBQJUOuUoAAoJEAFxB7BbsDrLCWAH/2wKvVA6k86G8+xzah5BWQtM MKGNH4A2KxIbf6PSR9tA9PMUsUUAkriXzlOrElJO8JfpWGnRIA1A4vGmU88Gbk+Y ixzWfPtuclgKG6XA3lQk04bEnFl2vemSWHpE2kqtp1yRFX2dE/pTGc/NS/wZj5D2 /mJzotbkX3KNStUEHQrTyGCrOevIwJPd+CcduZJaNyUGG1DBxYf2TQZBU80Mr6G0 FZBjD36FZYCEESuqBbUsO/RGv21keFHI+qHOlbKmwYxZDRZUWSFwl6pMVxtsWieV 4YhSVG6ZC2ah7Vrwp/+b29srbs3KGlxewk+AfX4k8n93ULzYQ+QCFfQsryANh2U= =F4hU -----END PGP SIGNATURE-----