Hello,
When I running Redis with YCSB, I got below warning from Gem5 (Redis with
redis-benchmark does not occur below warning).
warn: instruction 'fwait' unimplemented
warn: instruction 'frndint' unimplemented
warn: instruction 'fistp' unimplemented
warn: instruction 'f2xm1' unimplemented
warn: instruction 'ffree' unimplemented
warn: instruction 'fincstp' unimplemented
Also, below is from YCSB source code that is related to YCSB errors
(IndexOutOfBoundsException).
/**
* Reads a big-endian 8-byte long from an offset in the given array.
* @param bytes The array to read from.
* @return A long integer.
* @throws IndexOutOfBoundsException if the byte array is too small.
* @throws NullPointerException if the byte array is null.
*/
public static long bytesToLong(final byte[] bytes) {
return (bytes[0] & 0xFFL) << 56
| (bytes[1] & 0xFFL) << 48
| (bytes[2] & 0xFFL) << 40
| (bytes[3] & 0xFFL) << 32
| (bytes[4] & 0xFFL) << 24
| (bytes[5] & 0xFFL) << 16
| (bytes[6] & 0xFFL) << 8
| (bytes[7] & 0xFFL) << 0;
}
/**
* Writes a big-endian 8-byte long at an offset in the given array.
* @param val The value to encode.
* @throws IndexOutOfBoundsException if the byte array is too small.
*/
public static byte[] longToBytes(final long val) {
final byte[] bytes = new byte[8];
bytes[0] = (byte) (val >>> 56);
bytes[1] = (byte) (val >>> 48);
bytes[2] = (byte) (val >>> 40);
bytes[3] = (byte) (val >>> 32);
bytes[4] = (byte) (val >>> 24);
bytes[5] = (byte) (val >>> 16);
bytes[6] = (byte) (val >>> 8);
bytes[7] = (byte) (val >>> 0);
return bytes;
}
Maybe type inversion to/from long incurs floating-point instructions that are
not implemented in Gem5, which results in YCSB errors.
Is there any way I can solve this problem? - Is there any patch that
implemented those instructions?
I am sort of Gem5 beginner, implementing those instructions in Gem5 would be
hard for me ;(
Regards,
Miseon Han
-----Original Message-----
From: Ciro Santilli <ciro.santi...@gmail.com>
Sent: Tuesday, April 14, 2020 1:08 AM
To: gem5 users mailing list <gem5-users@gem5.org>; Miseon Han
<miseon....@us.skhynix.com>
Subject: Re: [gem5-users] Running YCSB in Gem5 FS
You have to try and debug it further to narrow down the exact operation gem5
seems to be doing wrong (--debug-flags ExecAll, GDB into guest).
This could be easy to spot, or extremely difficult if the divergence happened
way earlier in execution before the crash, but I don't see an alternative.
One possible approach especially for single threaded execution is to try and
compare QEMU ExecAll logs to QEMU instruction traces.
On Mon, Apr 13, 2020 at 10:58 PM Miseon Han <miseon....@us.skhynix.com> wrote:
>
> Hello,
>
>
>
> I made x86 disk image with ubuntu 16.06 and build kernel 4.8.13
> following
> http://www.lowepower.com/jason/setting-up-gem5-full-system.html.
> (using QEMU)
>
> Gem5 source code is downloaded using this: git clone
> https://gem5.googlesource.com/public/gem5
>
>
>
> Using QEMU, I installed Redis-4.0.0 and YCSB-0.17.0 in my created disk image.
> At QEMU, Redis and YCSB worked well.
>
> Redis: ./src/redis-server redis.conf
>
> YCSB: ./bin/ycsb load redis -s -P workloads/workloada -p
> "redis.host=127.0.0.1" -p "redis.port=6379"
>
>
>
> However, when I use Gem5 Full System mode (./build/X86/gem5.opt
> configs/example/fs.py –disk-images=myimage –kernel=mykernel
> –mem-size=4096MB), YCSB gives me error “IndexOutOfBoundsException: Index 17”.
>
>
>
> As far as I know, many papers used gem5 for simulating server-client model
> and used YCSB for client.
>
> My tested environment is one node for Redis and YCSB. So, I think Redis and
> YCSB should be worked fine in this environment.
>
>
>
> Is there any way I can solve this problem?
>
>
>
> Regards,
>
> Miseon Han
>
>
>
> _______________________________________________
> gem5-users mailing list
> gem5-users@gem5.org
> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
_______________________________________________
gem5-users mailing list
gem5-users@gem5.org
http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
