I didn't realize you actually replied.

I tried --smt but this is what I get:

gem5 Simulator System.  http://gem5.org
gem5 is copyrighted software; use the --copyright option for details.

gem5 compiled Jan 20 2020 22:23:14
gem5 started Jan 24 2020 22:48:21
gem5 executing on nirmal-cadsl2, pid 5776
command line: ./build/X86/gem5.opt ./configs/example/se.py --cpu-type=DerivO3CPU --caches -c 'tests/test-progs/hello/bin/x86/linux/hello;tests/test-progs/hello/bin/x86/linux/hello' --smt

Global frequency set at 1000000000000 ticks per second
warn: DRAM device capacity (8192 Mbytes) does not match the address range assigned (512 Mbytes)
0: system.remote_gdb: listening for remote gdb on port 7000
0: system.remote_gdb: listening for remote gdb on port 7001
panic: panic condition !intMasterPort.isConnected() occurred: Int port not connected to anything!
Memory Usage: 669696 KBytes
Program aborted at tick 0
--- BEGIN LIBC BACKTRACE ---
./build/X86/gem5.opt(_Z15print_backtracev+0x2c)[0x5635f509141c]
./build/X86/gem5.opt(_Z12abortHandleri+0x4a)[0x5635f50a376a]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x12890)[0x7fda9ac38890]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0xc7)[0x7fda9989fe97]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x141)[0x7fda998a1801]
./build/X86/gem5.opt(+0x52147f)[0x5635f4e1447f]
./build/X86/gem5.opt(_ZN6X86ISA10Interrupts4initEv+0x117)[0x5635f5175f67]
./build/X86/gem5.opt(+0x1190136)[0x5635f5a83136]
./build/X86/gem5.opt(+0x6fcbe4)[0x5635f4fefbe4]
/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x6ff3)[0x7fda9aee6753]
/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7d8)[0x7fda9b024908]
/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x5bf6)[0x7fda9aee5356]
/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7d8)[0x7fda9b024908]
/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x5bf6)[0x7fda9aee5356]
/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7d8)[0x7fda9b024908]
/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCode+0x19)[0x7fda9aedf5c9]
/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x6ac0)[0x7fda9aee6220]
/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7d8)[0x7fda9b024908]
/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x5bf6)[0x7fda9aee5356]
/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7d8)[0x7fda9b024908]
/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCode+0x19)[0x7fda9aedf5c9]
/usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyRun_StringFlags+0x76)[0x7fda9af8f6e6]
./build/X86/gem5.opt(_Z6m5MainiPPc+0x63)[0x5635f50a21a3]
./build/X86/gem5.opt(main+0x38)[0x5635f4dd06b8]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7)[0x7fda99882b97]
./build/X86/gem5.opt(_start+0x2a)[0x5635f4e015ba]
--- END LIBC BACKTRACE ---

Seems like there is a work around for this:
https://www.mail-archive.com/gem5-users@gem5.org/msg04271.html
http://reviews.gem5.org/r/1281/#review2999
This patch can be applied on an older version of gem5 on ubuntu 12.04.

However I want to run a multithreaded program. It doesn't look like gem5 supports it. Like you said, the number of threads can only be equal to number of programs.

As for Full System, This is what I found in the file src/cpu/o3/cpu.cc :

// SMT is not supported in FS mode yet.

Edit: markdown

Uh oh!

gem5 syscall emulation simultaneous multithreading (SMT) support #104

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