diff --git a/backend-simulators/pim/pim-simulator/src/bin/pim-simulator/main.rs b/backend-simulators/pim/pim-simulator/src/bin/pim-simulator/main.rs
index 56efb5b..77ea143 100644
--- a/backend-simulators/pim/pim-simulator/src/bin/pim-simulator/main.rs
+++ b/backend-simulators/pim/pim-simulator/src/bin/pim-simulator/main.rs
@@ -1,10 +1,13 @@
-use anyhow::{bail, Context, Result};
+use anyhow::{Context, Result, bail};
 use clap::Parser;
 use glob::glob;
+use pimcore::cpu::crossbar::Crossbar;
 use pimcore::json_to_instruction::json_to_executor;
+use pimcore::memory_manager::CoreMemory;
 use pimcore::tracing::TRACER;
 use serde_json::Value;
-use std::fs;
+use std::collections::HashMap;
+use std::fs::{self, read_link};
 use std::io::Write;
 use std::path::PathBuf;
 
@@ -43,8 +46,10 @@ fn main() -> Result<()> {
     let config_json = retrive_config(&args)?;
     let core_jsons = retrive_cores(&args)?;
     let memory = retrive_memory(&args)?;
-    let mut executor = json_to_executor::json_to_executor(config_json, core_jsons.iter());
-    populate_crossbar(&args, &mut executor);
+    let global_crossbars = get_crossbars(&config_json, &args).unwrap();
+    let crossbars = map_crossbars_to_cores(&config_json, &args, &global_crossbars);
+    let mut executor =
+        json_to_executor::json_to_executor(config_json, core_jsons.iter(), crossbars);
     set_memory(&mut executor, memory);
     TRACER
         .lock()
@@ -55,46 +60,100 @@ fn main() -> Result<()> {
     Ok(())
 }
 
-fn populate_crossbar(args: &Args, executor: &mut pimcore::Executable) {
-    let num_cores = executor.cpu_mut().num_core();
+fn map_crossbars_to_cores<'c>(
+    config: &Value,
+    args: &Args,
+    global_crossbars: &'c HashMap<String, Crossbar>,
+) -> Vec<Vec<&'c Crossbar>> {
+    let mut res = Vec::new();
+    let num_cores = config.get("core_cnt").unwrap().as_i64().unwrap() as i32;
 
     if let Some(folder) = args.folder.as_ref() {
         for core_idx in 0..num_cores {
             let core_folder = folder.join(format!("core_{}", core_idx));
+            res.push(Vec::new());
 
             if !core_folder.is_dir() {
                 continue;
             }
 
-            let mut bin_files: Vec<(u32, std::path::PathBuf)> = std::fs::read_dir(&core_folder)
-                .expect("Failed to read core directory")
-                .filter_map(|entry| {
-                    let path = entry.ok()?.path();
-                    let file_name = path.file_name()?.to_str()?;
+            let mut sym_link_files: Vec<(u32, std::path::PathBuf)> =
+                std::fs::read_dir(&core_folder)
+                    .expect("Failed to read core directory")
+                    .filter_map(|entry| {
+                        let entry = entry.ok()?;
+                        assert!(entry.metadata().unwrap().is_symlink());
+                        let path = entry.path();
+                        let file_name = path.file_name()?.to_str()?;
 
-                    if file_name.starts_with("crossbar_") && file_name.ends_with(".bin") {
-                        let num_str = &file_name[9..file_name.len() - 4];
-                        let num = num_str.parse::<u32>().ok()?;
-                        Some((num, path))
-                    } else {
-                        None
-                    }
-                })
-                .collect();
-            bin_files.sort_by_key(|&(num, _)| num);
-            let core = executor.cpu_mut().core(core_idx);
-            let (_memory, crossbars) = core.get_memory_crossbar();
+                        if file_name.starts_with("crossbar_") && file_name.ends_with(".bin") {
+                            let num_str = &file_name[9..file_name.len() - 4];
+                            let num = num_str.parse::<u32>().ok()?;
+                            Some((num, path))
+                        } else {
+                            None
+                        }
+                    })
+                    .collect();
+            sym_link_files.sort_by_key(|&(num, _)| num);
 
-            for (i, path) in bin_files {
-                let bytes = std::fs::read(path).expect("Failed to read binary file");
-                crossbars
-                    .get_mut(i as usize)
+            for (_, symlink) in sym_link_files {
+                let real_path = read_link(symlink).unwrap();
+                let path_as_str = real_path.to_str().unwrap();
+                assert!(
+                    global_crossbars.contains_key(path_as_str),
+                    "symlink point to {:?}\n a not stored crossbar",
+                    real_path
+                );
+
+                res.iter_mut()
+                    .next_back()
                     .unwrap()
-                    .execute_store(&bytes)
-                    .unwrap();
+                    .push(global_crossbars.get(path_as_str).unwrap());
             }
         }
     }
+    res
+}
+
+fn get_crossbars(config: &Value, args: &Args) -> anyhow::Result<HashMap<String, Crossbar>> {
+    let xbar_size = config.get("xbar_size").unwrap().as_array().unwrap();
+    let rows_crossbar = xbar_size[0].as_i64().unwrap() as usize;
+    let column_corssbar = xbar_size[1].as_i64().unwrap() as usize;
+    let mut res = HashMap::new();
+
+    if let Some(folder) = args.folder.as_ref() {
+        let weight_folder = folder.join("weights");
+        if !weight_folder.is_dir() {
+            bail!("Not a directory");
+        }
+        for weight_file in
+            std::fs::read_dir(&weight_folder).context("Weight folder not iterable")?
+        {
+            let weight_file = weight_file.context("File not iterable")?;
+            if weight_file
+                .metadata()
+                .context("Doesn't contain metadata")?
+                .is_dir()
+            {
+                continue;
+            }
+
+            let bytes = std::fs::read(weight_file.path()).expect("Failed to read binary file");
+            let mut crossbar =
+                Crossbar::new(column_corssbar * 4, rows_crossbar, CoreMemory::new());
+            crossbar.execute_store(&bytes).unwrap();
+            res.insert(
+                weight_file
+                    .path()
+                    .to_str()
+                    .context("file name not utf-8")?
+                    .to_string(),
+                crossbar,
+            );
+        }
+    }
+    Ok(res)
 }
 
 fn dump_memory(mut executor: pimcore::Executable, args: &Args) -> Result<()> {
@@ -170,7 +229,11 @@ fn retrive_cores(args: &Args) -> Result<Vec<Value>, anyhow::Error> {
         let pattern_str = pattern.to_str().context("Invalid path encoding")?;
         let mut paths: Vec<_> = glob(pattern_str)?.map(|x| x.unwrap()).collect();
         paths.sort_by_cached_key(|x| {
-            let mut x = x.file_stem().expect("Extracting the stem").to_str().expect("File not utf-8");
+            let mut x = x
+                .file_stem()
+                .expect("Extracting the stem")
+                .to_str()
+                .expect("File not utf-8");
             x = &x[5..];
             x.parse::<i32>().unwrap()
         });
diff --git a/backend-simulators/pim/pim-simulator/src/lib/cpu/crossbar.rs b/backend-simulators/pim/pim-simulator/src/lib/cpu/crossbar.rs
index cc61e80..6e2c202 100644
--- a/backend-simulators/pim/pim-simulator/src/lib/cpu/crossbar.rs
+++ b/backend-simulators/pim/pim-simulator/src/lib/cpu/crossbar.rs
@@ -38,14 +38,14 @@ impl Crossbar {
         self.memory.execute_store(0, element)
     }
 
-    pub fn load<T>(&mut self, size: usize) -> Result<Vec<&[T]>> where
+    pub fn load<T>(&self, size: usize) -> Result<Vec<&[T]>> where
             T: MemoryStorable, {
         if self.memory.get_len() <  size 
             //|| self.stored_bytes < size 
         {
             bail!("Loading outside crossbar boundary [{} {}] <  {}", self.stored_bytes, self.memory.get_len() ,  size);
         }
-        self.memory.load(0, size)
+        self.memory.load_const(0, size)
     }
 
 
diff --git a/backend-simulators/pim/pim-simulator/src/lib/cpu/mod.rs b/backend-simulators/pim/pim-simulator/src/lib/cpu/mod.rs
index cd90239..f2c6674 100644
--- a/backend-simulators/pim/pim-simulator/src/lib/cpu/mod.rs
+++ b/backend-simulators/pim/pim-simulator/src/lib/cpu/mod.rs
@@ -1,5 +1,5 @@
 use std::{collections::HashMap, fmt::Debug};
-use anyhow::{Context, Result};
+use anyhow::{Context, Result, ensure};
 
 use crate::{
     cpu::crossbar::Crossbar,
@@ -10,53 +10,44 @@ use crate::{
 pub mod crossbar;
 
 #[derive(Debug, Clone)]
-pub struct CPU {
-    cores: Box<[Core]>,
+pub struct CPU<'a> {
+    cores: Box<[Core<'a>]>,
 }
 
-impl CPU {
-    pub fn new(num_cores: impl TryToUsize) -> Self {
+impl<'a> CPU<'a> {
+    pub fn new(num_cores: impl TryToUsize, crossbars: Vec<Vec<&'a Crossbar>> ) -> Self {
         let num_cores = num_cores.try_into().expect("num_cores can not be negative");
-        let mut cores: Vec<Core> = std::iter::repeat_with(Core::new)
-            .take(num_cores + 1)
-            .collect();
+        assert!(crossbars.len() == num_cores + 1);
+        let mut cores = Vec::new();
+        for crossbar in crossbars {
+            cores.push(Core::new(crossbar));
+        }
         Self {
             cores: cores.into(),
         }
     }
 
-    pub fn reserve_crossbar(
-        &mut self,
-        num_crossbar: impl TryToUsize,
-        byte_width: impl TryToUsize,
-        height: impl TryToUsize,
-    ) {
-        let num_crossbar = num_crossbar
-            .try_into()
-            .expect("num_crossbar can not be negative");
-        let byte_width = byte_width
-            .try_into()
-            .expect("byte_width can not be negative");
-        let height = height.try_into().expect("height can not be negative");
-        for core in &mut self.cores {
-            core.reserve_crossbar(num_crossbar, byte_width, height);
-        }
+    pub fn host<'b>(&'b mut self) -> &'b mut Core<'a>
+        where 'a : 'b
+    {
+        & mut self.cores[0]
     }
 
-    pub fn host(&mut self) -> &mut Core {
-        &mut self.cores[0]
-    }
-
-    pub fn core(&mut self, index: impl TryToUsize) -> &mut Core {
+    pub fn core<'b >(&'b mut self, index: impl TryToUsize) -> &'b mut Core<'a>
+        where 'a : 'b
+    {
         let index = index.try_into().expect("can not be negative");
-        &mut self.cores[index]
+        & mut self.cores[index]
     }
 
     pub fn num_core(&self) -> usize {
         self.cores.len()
     }
 
-    pub(crate) fn host_and_cores(&mut self, core: impl TryToUsize) -> (&mut Core, &mut Core) {
+    pub(crate) fn host_and_cores<'b, 'c >(&'b mut self, core: impl TryToUsize) -> (&'c mut Core<'a>, &'c mut Core<'a>) 
+    where 'a: 'b,
+          'b: 'c
+    {
         let core = core.try_into().expect("core can not be negative");
         assert_ne!(
             core, 0,
@@ -70,45 +61,29 @@ impl CPU {
         (host, core)
     }
 
-    pub fn get_multiple_cores<const N: usize>(&mut self, indices: [usize; N]) -> [&mut Core; N] {
+    pub fn get_multiple_cores<'b, const N: usize>(&'b mut self, indices: [usize; N]) -> [&'b mut Core<'a>; N] 
+    where 'a : 'b
+    {
         self.cores.get_disjoint_mut(indices).unwrap()
     }
 }
 
 #[derive(Debug, Clone)]
-pub struct Core {
-    crossbars: Vec<Crossbar>,
+pub struct Core<'a> {
+    crossbars: Vec<&'a Crossbar>,
     memory: CoreMemory,
     registers: [i32; 32],
 }
 
-impl Core {
-    fn new() -> Self {
+impl<'a> Core<'a> {
+    fn new(crossbars : Vec<&'a Crossbar>) -> Self {
         Self {
-            crossbars: Vec::new(),
+            crossbars,
             memory: CoreMemory::new(),
             registers: [0; 32],
         }
     }
 
-    pub fn reserve_crossbar(
-        &mut self,
-        num_crossbar: impl TryToUsize,
-        width: impl TryToUsize,
-        height: impl TryToUsize,
-    ) {
-        let num_crossbar = num_crossbar
-            .try_into()
-            .expect("num_crossbar can not be negative");
-        let width = width.try_into().expect("width can not be negative");
-        let height = height.try_into().expect("height can not be negative");
-        for _ in 0..num_crossbar {
-            let mut crossbar = CoreMemory::new();
-            crossbar.set_capacity(width * height);
-            self.crossbars.push(Crossbar::new(width, height, crossbar));
-        }
-    }
-
     pub fn execute_load<T>(&mut self) -> Result<Vec<&[T]>>
     where
         T: MemoryStorable,
@@ -157,7 +132,7 @@ impl Core {
         self.memory.load(address, size)
     }
 
-    pub fn get_memory_crossbar(&mut self) -> (&mut CoreMemory, &mut Vec<Crossbar>) {
+    pub fn get_memory_crossbar(&mut self) -> (&mut CoreMemory, &mut Vec<&'a Crossbar>) {
         let Self {
             crossbars,
             memory,
diff --git a/backend-simulators/pim/pim-simulator/src/lib/instruction_set/isa.rs b/backend-simulators/pim/pim-simulator/src/lib/instruction_set/isa.rs
index 2eff04b..e52224a 100644
--- a/backend-simulators/pim/pim-simulator/src/lib/instruction_set/isa.rs
+++ b/backend-simulators/pim/pim-simulator/src/lib/instruction_set/isa.rs
@@ -76,7 +76,8 @@ pub fn functor_to_name(functor: usize) -> &'static str {
 ///////////////////////////////////////////////////////////////
 /////////////////Scalar/register Instructions//////////////////
 ///////////////////////////////////////////////////////////////
-pub fn sldi(cores: &mut CPU, data: InstructionData) -> Result<InstructionStatus> {
+pub fn sldi(cores: &mut CPU, data: InstructionData) -> Result<InstructionStatus> 
+{
     TRACER.lock().unwrap().pre_sldi(cores, data);
     let (core_indx, rd, imm) = data.get_core_rd_imm();
     let core = cores.core(core_indx);
diff --git a/backend-simulators/pim/pim-simulator/src/lib/instruction_set/mod.rs b/backend-simulators/pim/pim-simulator/src/lib/instruction_set/mod.rs
index 39048fe..af6da35 100644
--- a/backend-simulators/pim/pim-simulator/src/lib/instruction_set/mod.rs
+++ b/backend-simulators/pim/pim-simulator/src/lib/instruction_set/mod.rs
@@ -40,7 +40,9 @@ impl Instruction {
         Self { data, functor }
     }
 
-    pub fn execute(&self, cpu: &mut CPU) -> InstructionStatus {
+    pub fn execute<'a, 'b>(&'b self, cpu: &mut CPU<'a>) -> InstructionStatus
+    where 'a : 'b
+    {
         (self.functor)(cpu, self.data)
             .with_context(|| format!("Instruction: {}", functor_to_name(self.functor as usize)))
             .with_context(|| format!("Error in core: {}", self.data.core_indx() - 1))
diff --git a/backend-simulators/pim/pim-simulator/src/lib/json_to_instruction/json_to_executor.rs b/backend-simulators/pim/pim-simulator/src/lib/json_to_instruction/json_to_executor.rs
index cc7d507..805c074 100644
--- a/backend-simulators/pim/pim-simulator/src/lib/json_to_instruction/json_to_executor.rs
+++ b/backend-simulators/pim/pim-simulator/src/lib/json_to_instruction/json_to_executor.rs
@@ -1,10 +1,11 @@
 use core::panic;
+use std::collections::HashMap;
 
 use serde_json::{Map, Value};
 
 use crate::{
     CoreInstructionsBuilder, Executable,
-    cpu::{CPU, crossbar},
+    cpu::{CPU, crossbar::{self, Crossbar}},
     instruction_set::{
         InstructionsBuilder,
         instruction_data::{self, InstructionData, InstructionDataBuilder},
@@ -13,18 +14,20 @@ use crate::{
     memory_manager::type_traits::TryToUsize,
 };
 
+
 pub fn json_to_executor<'a>(
     config: Value,
     mut cores: impl Iterator<Item = &'a Value>,
-) -> Executable {
+    crossbars : Vec<Vec<&'a Crossbar>>
+) -> Executable<'a> {
     let cell_precision = config.get("cell_precision").unwrap().as_i64().unwrap() as i32;
     let core_cnt = config.get("core_cnt").unwrap().as_i64().unwrap() as i32 - 1;
     let xbar_count = config.get("xbar_array_count").unwrap().as_i64().unwrap() as i32;
     let xbar_size = config.get("xbar_size").unwrap().as_array().unwrap();
     let rows_crossbar = xbar_size[0].as_i64().unwrap() as i32;
     let column_corssbar = xbar_size[1].as_i64().unwrap() as i32;
-    let mut cpu = CPU::new(core_cnt);
-    cpu.reserve_crossbar(xbar_count, column_corssbar * 4, rows_crossbar);
+
+    let mut cpu = CPU::new(core_cnt, crossbars);
     let mut core_insts_builder = CoreInstructionsBuilder::new(core_cnt as usize);
     cores.next();
     for core_indx in 1..=core_cnt {
diff --git a/backend-simulators/pim/pim-simulator/src/lib/memory_manager/mod.rs b/backend-simulators/pim/pim-simulator/src/lib/memory_manager/mod.rs
index bcc683b..fc2ecb4 100644
--- a/backend-simulators/pim/pim-simulator/src/lib/memory_manager/mod.rs
+++ b/backend-simulators/pim/pim-simulator/src/lib/memory_manager/mod.rs
@@ -111,6 +111,24 @@ where {
         Ok(res)
     }
 
+    pub fn load_const<T>(&self, address: impl TryToUsize, size: impl TryToUsize) -> Result<Vec<&[T]>>
+    where
+        T: MemoryStorable,
+    {
+        let address = address.try_into().expect("address can not be negative");
+        let size = size.try_into().expect("size can not be negative");
+        let Self {
+            memory,
+            load_requests,
+        } = self;
+        let mut res = Vec::new();
+        let memory_slice = &memory[address..address + size];
+        let memory_slice = unsafe { slice_from_u8(memory_slice) }
+            .with_context(|| format!("Accessing from {} to {}",  address, address + size))?;
+        res.push(memory_slice);
+        Ok(res)
+    }
+
     pub fn load<T>(&mut self, address: impl TryToUsize, size: impl TryToUsize) -> Result<Vec<&[T]>>
     where
         T: MemoryStorable,
diff --git a/backend-simulators/pim/pim-simulator/src/lib/pimcore.rs b/backend-simulators/pim/pim-simulator/src/lib/pimcore.rs
index 3231c90..f70186e 100644
--- a/backend-simulators/pim/pim-simulator/src/lib/pimcore.rs
+++ b/backend-simulators/pim/pim-simulator/src/lib/pimcore.rs
@@ -67,14 +67,14 @@ impl From<Instructions> for CoreInstruction {
 }
 
 #[derive(Debug, Clone)]
-pub struct Executable {
-    cpu: CPU,
+pub struct Executable<'a> {
+    cpu: CPU<'a>,
     core_instructions: Vec<CoreInstruction>,
     send_recv : SendRecv,
 }
 
-impl Executable {
-    pub fn new(cpu: CPU, core_instructions: Vec<CoreInstruction>) -> Self {
+impl<'a> Executable<'a> {
+    pub fn new(cpu: CPU<'a>, core_instructions: Vec<CoreInstruction>) -> Executable<'a> {
         let num_core = cpu.num_core();
         let send_recv = SendRecv::new(num_core);
         assert_eq!(num_core, core_instructions.len(), "Some core doesn't have is list of istruction (required even if empty)");
@@ -85,12 +85,14 @@ impl Executable {
         }
     }
 
-    pub fn execute(&mut self) {
+    pub fn execute<'b>(&'b mut self) 
+    where 'a : 'b
+    {
         let Self {
-            cpu,
+            cpu  ,
             core_instructions,
             send_recv
-        } = self;
+        }   = self;
         let mut cpu_progressed = 0;
         let max_core = cpu.num_core();
         let mut index_unit = 0;
@@ -124,11 +126,11 @@ impl Executable {
         }
     }
 
-    pub fn cpu(&self) -> &CPU {
+    pub fn cpu(&self) -> &CPU<'a> {
         &self.cpu
     }
 
-    pub fn cpu_mut(&mut self) -> &mut CPU {
+    pub fn cpu_mut(&mut self) -> &mut CPU<'a> {
         &mut self.cpu
     }
 
@@ -143,64 +145,13 @@ impl Executable {
     }
 }
 
-fn handle_wait_sync(cpu: &mut CPU, core_instructions: &mut [CoreInstruction], core_result: InstructionStatus) {
+fn handle_wait_sync<'a, 'b, 'c >(cpu: &'b mut CPU<'a>, core_instructions: &'c mut [CoreInstruction], core_result: InstructionStatus)
+where 'a : 'b,
+      'a : 'c
+{
 }
 
 
-#[cfg(test)]
-mod test {
-    use super::*;
-    use crate::instruction_set::instruction_data::InstructionDataBuilder;
-    use crate::instruction_set::{InstructionsBuilder, isa::*};
-
-    #[test]
-    fn test_only_host() {
-        let mut cpu = CPU::new(0);
-        cpu.host()
-            .execute_store(0, &[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]);
-        let mut inst_builder = InstructionsBuilder::new();
-        let mut idata_build = InstructionDataBuilder::new();
-        idata_build.set_core_indx(0).fix_core_indx();
-        inst_builder.make_inst(sldi, idata_build.set_rdimm(1, 0).build());
-        inst_builder.make_inst(sld, idata_build.set_rdr1(1, 1).build());
-        inst_builder.make_inst(sldi, idata_build.set_rdimm(2, 8).build());
-        inst_builder.make_inst(sld, idata_build.set_rdr1(2, 2).build());
-        inst_builder.make_inst(sadd, idata_build.set_rdr1r2(2, 1, 2).build());
-        let mut core_instruction = vec![inst_builder.build().into()];
-        let mut executable = Executable::new(cpu, core_instruction);
-        executable.execute();
-        assert_eq!(executable.cpu_mut().host().register(2), 4, "Not sum to 4");
-    }
-
-    #[test]
-    fn test_10_core_same_code() {
-        let setup_core = |index: usize, cpu: &mut CPU| -> Instructions {
-            cpu.core(index)
-                .execute_store(0, &[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]);
-            let mut inst_builder = InstructionsBuilder::new();
-            let mut idata_build = InstructionDataBuilder::new();
-            idata_build.set_core_indx(index as i32).fix_core_indx();
-            inst_builder.make_inst(sldi, idata_build.set_rdimm(1, 0).build());
-            inst_builder.make_inst(sld, idata_build.set_rdr1(1, 1).build());
-            inst_builder.make_inst(sldi, idata_build.set_rdimm(2, 8).build());
-            inst_builder.make_inst(sld, idata_build.set_rdr1(2, 2).build());
-            inst_builder.make_inst(sadd, idata_build.set_rdr1r2(2, 1, 2).build());
-            inst_builder.build()
-        };
-
-        let mut cpu = CPU::new(10);
-        let mut core_instruction = Vec::new();
-        for i in 0..cpu.num_core() {
-            core_instruction.push(setup_core(i, &mut cpu).into())
-        }
-
-        let mut executable = Executable::new(cpu, core_instruction);
-        executable.execute();
-        for i in 0.. executable.cpu.num_core() {
-            assert_eq!(executable.cpu_mut().core(i).register(2), 4, "Core {} not sum to 4", i);
-        }
-    }
 
     
 
-}
diff --git a/backend-simulators/pim/pim-simulator/src/lib/send_recv.rs b/backend-simulators/pim/pim-simulator/src/lib/send_recv.rs
index c6322fd..6f68e0a 100644
--- a/backend-simulators/pim/pim-simulator/src/lib/send_recv.rs
+++ b/backend-simulators/pim/pim-simulator/src/lib/send_recv.rs
@@ -41,14 +41,16 @@ impl SendRecv {
     }
 }
 
-pub fn handle_send_recv(
-    cpu: &mut CPU,
-    core_instructions: &mut [CoreInstruction],
-    send_recv: &mut SendRecv,
+pub fn handle_send_recv<'a, 'b >(
+    cpu: &'b mut CPU<'a>,
+    core_instructions: & mut [CoreInstruction],
+    send_recv: & mut SendRecv,
     core_result: InstructionStatus,
-) -> bool {
-    let transfer_memory = |cpu: &mut CPU,
-                           core_instructions: &mut [CoreInstruction],
+) -> bool
+where 'a : 'b
+{
+    let transfer_memory = |cpu: &'b mut CPU<'a>,
+                           core_instructions: & mut [CoreInstruction],
                            sender: Option<SendRecvInfo>,
                            receiver: Option<SendRecvInfo>| {
         if let Some(sender) = sender
@@ -117,7 +119,7 @@ pub fn handle_send_recv(
                 send_recv.sending[sender] = None;
                 send_recv.receiving[receiver] = None;
             }
-            return transfered;
+            transfered
         }
         InstructionStatus::Reciving(instruction_data) => {
             let (core_idx, imm_core) = instruction_data.get_core_immcore();
@@ -146,7 +148,7 @@ pub fn handle_send_recv(
                 send_recv.sending[sender] = None;
                 send_recv.receiving[receiver] = None;
             }
-            return transfered;
+            transfered
         }
         _ => false,
     }