Hi Janne, Thanks a lot ! I should have checked it earlier..I got it :-) Basically I would like to compile the client read and write C/C++ codes and then later profile the executables with valgrind and other profiling tools. The reason being I want to see the function calls, execution time etc. This is very easy with the given Librados example. I am already doing the profiling of executables. What you have pointed out rearding *fio*, this is exactly my next goal (you read my mind). Given where I am at the moment (a Ceph deployment cluster) and given what I want to achieve (profile the executables of the read write test codes with high number of read and writes), how can I bring *fio* in it? May be there are already some Ceph test codes with high number of write and read calls in parallel? I have come across this one example *librbd* test code in Ceph repository ( https://github.com/ceph/ceph/blob/master/examples/librbd/hello_world.cc ) .......... On Thu, Apr 23, 2020 at 4:16 PM Janne Johansson <icepic.dz@xxxxxxxxx> wrote: > > > Den tors 23 apr. 2020 kl 16:07 skrev Bobby <italienisch1987@xxxxxxxxx>: > >> Hi, >> >> I am using Ceph in developer mode. Currently I am implementing Librados >> examples which are also available in Introduction to Librados section >> >> https://docs.ceph.com/docs/master/rados/api/librados-intro/#step-3-creating-an-i-o-context >> . >> It says once your app has a cluster handle and a connection to a Ceph >> Storage Cluster, you may create an I/O Context and begin reading and >> writing data. For example, >> >> *err = rados_write(io, "hw", "Hello World!", 12, 0); >> > > >> >> My question, Is "12" is the number of writes? Because I want to test the >> with high number of read and writes. >> >> Looking for help ! >> > > Just check what parameters the function takes: > CEPH_RADOS_API > <https://docs.ceph.com/docs/master/rados/api/librados/#c.CEPH_RADOS_API> > int rados_write(rados_ioctx_t > <https://docs.ceph.com/docs/master/rados/api/librados/#c.rados_ioctx_t> > * io*, const char ** oid*, const char ** buf*, size_t* len*, uint64_t > * off*)¶ > <https://docs.ceph.com/docs/master/rados/api/librados/#c.rados_write> > > Write *len* bytes from *buf* into the *oid* object, starting at offset > *off*. The value of *len* must be <= UINT_MAX/2. > > > The 12 seems to be the lenght of "Hello World!" in bytes, which matches > what a normal write() call would need. > In order to test high number of writes, you need to send lots of write > calls in parallel. > > (Or just get fio with rbd support compiled in, this is a solved problem > already how to benchmark ceph at a low level) > > -- > May the most significant bit of your life be positive. > _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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