Is maximum swap usage tunable?

[Mike]

On 3/4/2018 11:57 PM, bob prohaska wrote:
> On Sun, Mar 04, 2018 at 01:40:03PM -0800, bob prohaska wrote:
>> make -j4 buildworld 
>[snip]


I tried a buildworld using spinning rust for swap connected via USB"

========

/usr/bin/make -j3 buildworld


[lots of output omitted, can be supplied if needed]


--- Sema/SemaExprCXX.o ---
c++  -O2 -pipe
-I/usr/obj/usr/src/arm64.aarch64/tmp/obj-tools/lib/clang/libclang
-I/usr/obj/usr/src/arm64.aarch64/tmp/obj-tools/lib/clang/libllvm
-I/usr/src/contrib/llvm/tools/clang/lib/Basic
-I/usr/src/contrib/llvm/tools/clang/lib/Driver
-I/usr/src/contrib/llvm/tools/clang/include -I/usr/src/lib/clang/include
-I/usr/src/contrib/llvm/include -DLLVM_BUILD_GLOBAL_ISEL
-D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS
-DLLVM_DEFAULT_TARGET_TRIPLE=\"aarch64-unknown-freebsd12.0\"
-DLLVM_HOST_TRIPLE=\"aarch64-unknown-freebsd12.0\"
-DDEFAULT_SYSROOT=\"/usr/obj/usr/src/arm64.aarch64/tmp\"
-ffunction-sections -fdata-sections -gline-tables-only -MD
-MF.depend.Sema_SemaExprCXX.o -MTSema/SemaExprCXX.o -Qunused-arguments
-I/usr/obj/usr/src/arm64.aarch64/tmp/legacy/usr/include  -std=c++11
-fno-exceptions -fno-rtti -gline-tables-only -stdlib=libc++
-Wno-c++11-extensions  -c
/usr/src/contrib/llvm/tools/clang/lib/Sema/SemaExprCXX.cpp -o
Sema/SemaExprCXX.o

--- Sema/SemaExprMember.o ---
c++  -O2 -pipe
-I/usr/obj/usr/src/arm64.aarch64/tmp/obj-tools/lib/clang/libclang
-I/usr/obj/usr/src/arm64.aarch64/tmp/obj-tools/lib/clang/libllvm
-I/usr/src/contrib/llvm/tools/clang/lib/Basic
-I/usr/src/contrib/llvm/tools/clang/lib/Driver
-I/usr/src/contrib/llvm/tools/clang/include -I/usr/src/lib/clang/include
-I/usr/src/contrib/llvm/include -DLLVM_BUILD_GLOBAL_ISEL
-D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS
-DLLVM_DEFAULT_TARGET_TRIPLE=\"aarch64-unknown-freebsd12.0\"
-DLLVM_HOST_TRIPLE=\"aarch64-unknown-freebsd12.0\"
-DDEFAULT_SYSROOT=\"/usr/obj/usr/src/arm64.aarch64/tmp\"
-ffunction-sections -fdata-sections -gline-tables-only -MD
-MF.depend.Sema_SemaExprMember.o -MTSema/SemaExprMember.o
-Qunused-arguments
-I/usr/obj/usr/src/arm64.aarch64/tmp/legacy/usr/include  -std=c++11
-fno-exceptions -fno-rtti -gline-tables-only -stdlib=libc++
-Wno-c++11-extensions  -c
/usr/src/contrib/llvm/tools/clang/lib/Sema/SemaExprMember.cpp -o
Sema/SemaExprMember.o

--- Sema/SemaExprObjC.o ---
c++  -O2 -pipe
-I/usr/obj/usr/src/arm64.aarch64/tmp/obj-tools/lib/clang/libclang
-I/usr/obj/usr/src/arm64.aarch64/tmp/obj-tools/lib/clang/libllvm
-I/usr/src/contrib/llvm/tools/clang/lib/Basic
-I/usr/src/contrib/llvm/tools/clang/lib/Driver
-I/usr/src/contrib/llvm/tools/clang/include -I/usr/src/lib/clang/include
-I/usr/src/contrib/llvm/include -DLLVM_BUILD_GLOBAL_ISEL
-D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS
-DLLVM_DEFAULT_TARGET_TRIPLE=\"aarch64-unknown-freebsd12.0\"
-DLLVM_HOST_TRIPLE=\"aarch64-unknown-freebsd12.0\"
-DDEFAULT_SYSROOT=\"/usr/obj/usr/src/arm64.aarch64/tmp\"
-ffunction-sections -fdata-sections -gline-tables-only -MD
-MF.depend.Sema_SemaExprObjC.o -MTSema/SemaExprObjC.o -Qunused-arguments
-I/usr/obj/usr/src/arm64.aarch64/tmp/legacy/usr/include  -std=c++11
-fno-exceptions -fno-rtti -gline-tables-only -stdlib=libc++
-Wno-c++11-extensions  -c
/usr/src/contrib/llvm/tools/clang/lib/Sema/SemaExprObjC.cpp -o
Sema/SemaExprObjC.o

Killed
*** [all_subdir_lib/clang/libclang] Error code 137

make[3]: stopped in /usr/src/lib/clang
1 error

make[3]: stopped in /usr/src/lib/clang
*** [cross-tools] Error code 2

make[2]: stopped in /usr/src
1 error

make[2]: stopped in /usr/src
*** [_cross-tools] Error code 2

make[1]: stopped in /usr/src
1 error

make[1]: stopped in /usr/src
*** [buildworld] Error code 2

make: stopped in /usr/src
1 error

make: stopped in /usr/src





>From /var/log/messages

Mar  4 23:32:39 rpi3 kernel: pid 27325 (c++), uid 0, was killed: out of
swap space
Mar  4 23:32:54 rpi3 kernel: pid 27322 (c++), uid 0, was killed: out of
swap space
Mar  4 23:32:54 rpi3 kernel: pid 27387 (c++), uid 0, was killed: out of
swap space
Mar  4 23:32:54 rpi3 kernel: pid 24978 (make), uid 0, was killed: out of
swap space
Mar  4 23:32:54 rpi3 kernel: pid 757 (qmgr), uid 125, was killed: out of
swap space



# swapctl -l
Device:       1024-blocks     Used:
/dev/md99       1048576     13248

=======


I plan to try again, same hardware but with 2GB swap space.