== sanity test 255a: check 'lfs ladvise -a willread' ===== 22:20:18 (1767324018)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.81513 s, 15.4 MB/s
ladvise: range [2, 1] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: range [2, 2] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: conflicting arguments of -l and -e
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

Synchronous ladvise should wait
fail_val=8
fail_loc=0x237
Asynchronous ladvise shouldn't wait
llite.lustre-ffff8dd4d0e19800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.570419
Iter 1/10: OSS cache speed: 0.667028
Iter 1/10: ladvise speed: 0.71951
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.600957
Iter 2/10: OSS cache speed: 0.633915
Iter 2/10: ladvise speed: 0.647249
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.575058
Iter 3/10: OSS cache speed: 0.660342
Iter 3/10: ladvise speed: 0.772959
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.548257
Iter 4/10: OSS cache speed: 0.717188
Iter 4/10: ladvise speed: 0.68331
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.561282
Iter 5/10: OSS cache speed: 0.769473
Iter 5/10: ladvise speed: 0.92048
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.766456
Iter 6/10: OSS cache speed: 0.860943
Iter 6/10: ladvise speed: 0.800745
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.678313
Iter 7/10: OSS cache speed: 0.803463
Iter 7/10: ladvise speed: 0.868741
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.719717
Iter 8/10: OSS cache speed: 0.837323
Iter 8/10: ladvise speed: 0.806729
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.739592
Iter 9/10: OSS cache speed: 0.852437
Iter 9/10: ladvise speed: 0.977269
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.975404
Iter 10/10: OSS cache speed: 1.48671
Iter 10/10: ladvise speed: 1.35078
Average uncached read: .67
Average speedup with OSS cached read:  .82 = +22%
Average speedup with ladvise willread:  .85 = +26%
fail_loc=0